2 * This file is part of cparser.
3 * Copyright (C) 2007-2008 Matthias Braun <matze@braunis.de>
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License
7 * as published by the Free Software Foundation; either version 2
8 * of the License, or (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
27 #include "diagnostic.h"
28 #include "format_check.h"
34 #include "type_hash.h"
36 #include "lang_features.h"
38 #include "adt/bitfiddle.h"
39 #include "adt/error.h"
40 #include "adt/array.h"
42 //#define PRINT_TOKENS
43 #define MAX_LOOKAHEAD 2
46 declaration_t *old_declaration;
48 unsigned short namespc;
51 typedef struct gnu_attribute_t gnu_attribute_t;
52 struct gnu_attribute_t {
53 gnu_attribute_kind_t kind;
54 gnu_attribute_t *next;
63 typedef struct declaration_specifiers_t declaration_specifiers_t;
64 struct declaration_specifiers_t {
65 source_position_t source_position;
66 unsigned char declared_storage_class;
67 unsigned char alignment; /**< Alignment, 0 if not set. */
68 unsigned int is_inline : 1;
69 unsigned int deprecated : 1;
70 decl_modifiers_t decl_modifiers; /**< MS __declspec extended modifier mask */
71 gnu_attribute_t *gnu_attributes; /**< list of GNU attributes */
72 const char *deprecated_string; /**< can be set if declaration was marked deprecated. */
73 symbol_t *get_property_sym; /**< the name of the get property if set. */
74 symbol_t *put_property_sym; /**< the name of the put property if set. */
79 * An environment for parsing initializers (and compound literals).
81 typedef struct parse_initializer_env_t {
82 type_t *type; /**< the type of the initializer. In case of an
83 array type with unspecified size this gets
84 adjusted to the actual size. */
85 declaration_t *declaration; /**< the declaration that is initialized if any */
86 bool must_be_constant;
87 } parse_initializer_env_t;
89 typedef declaration_t* (*parsed_declaration_func) (declaration_t *declaration);
92 static token_t lookahead_buffer[MAX_LOOKAHEAD];
93 static int lookahead_bufpos;
94 static stack_entry_t *environment_stack = NULL;
95 static stack_entry_t *label_stack = NULL;
96 static scope_t *global_scope = NULL;
97 static scope_t *scope = NULL;
98 static declaration_t *last_declaration = NULL;
99 static declaration_t *current_function = NULL;
100 static switch_statement_t *current_switch = NULL;
101 static statement_t *current_loop = NULL;
102 static ms_try_statement_t *current_try = NULL;
103 static goto_statement_t *goto_first = NULL;
104 static goto_statement_t *goto_last = NULL;
105 static label_statement_t *label_first = NULL;
106 static label_statement_t *label_last = NULL;
107 static struct obstack temp_obst;
109 static source_position_t null_position = { NULL, 0 };
111 /* symbols for Microsoft extended-decl-modifier */
112 static const symbol_t *sym_align = NULL;
113 static const symbol_t *sym_allocate = NULL;
114 static const symbol_t *sym_dllimport = NULL;
115 static const symbol_t *sym_dllexport = NULL;
116 static const symbol_t *sym_naked = NULL;
117 static const symbol_t *sym_noinline = NULL;
118 static const symbol_t *sym_noreturn = NULL;
119 static const symbol_t *sym_nothrow = NULL;
120 static const symbol_t *sym_novtable = NULL;
121 static const symbol_t *sym_property = NULL;
122 static const symbol_t *sym_get = NULL;
123 static const symbol_t *sym_put = NULL;
124 static const symbol_t *sym_selectany = NULL;
125 static const symbol_t *sym_thread = NULL;
126 static const symbol_t *sym_uuid = NULL;
127 static const symbol_t *sym_deprecated = NULL;
128 static const symbol_t *sym_restrict = NULL;
129 static const symbol_t *sym_noalias = NULL;
131 /** The token anchor set */
132 static unsigned char token_anchor_set[T_LAST_TOKEN];
134 /** The current source position. */
135 #define HERE &token.source_position
137 static type_t *type_valist;
139 static statement_t *parse_compound_statement(bool inside_expression_statement);
140 static statement_t *parse_statement(void);
142 static expression_t *parse_sub_expression(unsigned precedence);
143 static expression_t *parse_expression(void);
144 static type_t *parse_typename(void);
146 static void parse_compound_type_entries(declaration_t *compound_declaration);
147 static declaration_t *parse_declarator(
148 const declaration_specifiers_t *specifiers, bool may_be_abstract);
149 static declaration_t *record_declaration(declaration_t *declaration);
151 static void semantic_comparison(binary_expression_t *expression);
153 #define STORAGE_CLASSES \
160 #define TYPE_QUALIFIERS \
167 #ifdef PROVIDE_COMPLEX
168 #define COMPLEX_SPECIFIERS \
170 #define IMAGINARY_SPECIFIERS \
173 #define COMPLEX_SPECIFIERS
174 #define IMAGINARY_SPECIFIERS
177 #define TYPE_SPECIFIERS \
192 case T___builtin_va_list: \
197 #define DECLARATION_START \
202 #define TYPENAME_START \
207 * Allocate an AST node with given size and
208 * initialize all fields with zero.
210 static void *allocate_ast_zero(size_t size)
212 void *res = allocate_ast(size);
213 memset(res, 0, size);
217 static declaration_t *allocate_declaration_zero(void)
219 declaration_t *declaration = allocate_ast_zero(sizeof(declaration_t));
220 declaration->type = type_error_type;
221 declaration->alignment = 0;
226 * Returns the size of a statement node.
228 * @param kind the statement kind
230 static size_t get_statement_struct_size(statement_kind_t kind)
232 static const size_t sizes[] = {
233 [STATEMENT_INVALID] = sizeof(invalid_statement_t),
234 [STATEMENT_EMPTY] = sizeof(empty_statement_t),
235 [STATEMENT_COMPOUND] = sizeof(compound_statement_t),
236 [STATEMENT_RETURN] = sizeof(return_statement_t),
237 [STATEMENT_DECLARATION] = sizeof(declaration_statement_t),
238 [STATEMENT_IF] = sizeof(if_statement_t),
239 [STATEMENT_SWITCH] = sizeof(switch_statement_t),
240 [STATEMENT_EXPRESSION] = sizeof(expression_statement_t),
241 [STATEMENT_CONTINUE] = sizeof(statement_base_t),
242 [STATEMENT_BREAK] = sizeof(statement_base_t),
243 [STATEMENT_GOTO] = sizeof(goto_statement_t),
244 [STATEMENT_LABEL] = sizeof(label_statement_t),
245 [STATEMENT_CASE_LABEL] = sizeof(case_label_statement_t),
246 [STATEMENT_WHILE] = sizeof(while_statement_t),
247 [STATEMENT_DO_WHILE] = sizeof(do_while_statement_t),
248 [STATEMENT_FOR] = sizeof(for_statement_t),
249 [STATEMENT_ASM] = sizeof(asm_statement_t),
250 [STATEMENT_MS_TRY] = sizeof(ms_try_statement_t),
251 [STATEMENT_LEAVE] = sizeof(leave_statement_t)
253 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
254 assert(sizes[kind] != 0);
259 * Returns the size of an expression node.
261 * @param kind the expression kind
263 static size_t get_expression_struct_size(expression_kind_t kind)
265 static const size_t sizes[] = {
266 [EXPR_INVALID] = sizeof(expression_base_t),
267 [EXPR_REFERENCE] = sizeof(reference_expression_t),
268 [EXPR_CONST] = sizeof(const_expression_t),
269 [EXPR_CHARACTER_CONSTANT] = sizeof(const_expression_t),
270 [EXPR_WIDE_CHARACTER_CONSTANT] = sizeof(const_expression_t),
271 [EXPR_STRING_LITERAL] = sizeof(string_literal_expression_t),
272 [EXPR_WIDE_STRING_LITERAL] = sizeof(wide_string_literal_expression_t),
273 [EXPR_COMPOUND_LITERAL] = sizeof(compound_literal_expression_t),
274 [EXPR_CALL] = sizeof(call_expression_t),
275 [EXPR_UNARY_FIRST] = sizeof(unary_expression_t),
276 [EXPR_BINARY_FIRST] = sizeof(binary_expression_t),
277 [EXPR_CONDITIONAL] = sizeof(conditional_expression_t),
278 [EXPR_SELECT] = sizeof(select_expression_t),
279 [EXPR_ARRAY_ACCESS] = sizeof(array_access_expression_t),
280 [EXPR_SIZEOF] = sizeof(typeprop_expression_t),
281 [EXPR_ALIGNOF] = sizeof(typeprop_expression_t),
282 [EXPR_CLASSIFY_TYPE] = sizeof(classify_type_expression_t),
283 [EXPR_FUNCNAME] = sizeof(funcname_expression_t),
284 [EXPR_BUILTIN_SYMBOL] = sizeof(builtin_symbol_expression_t),
285 [EXPR_BUILTIN_CONSTANT_P] = sizeof(builtin_constant_expression_t),
286 [EXPR_BUILTIN_PREFETCH] = sizeof(builtin_prefetch_expression_t),
287 [EXPR_OFFSETOF] = sizeof(offsetof_expression_t),
288 [EXPR_VA_START] = sizeof(va_start_expression_t),
289 [EXPR_VA_ARG] = sizeof(va_arg_expression_t),
290 [EXPR_STATEMENT] = sizeof(statement_expression_t),
292 if(kind >= EXPR_UNARY_FIRST && kind <= EXPR_UNARY_LAST) {
293 return sizes[EXPR_UNARY_FIRST];
295 if(kind >= EXPR_BINARY_FIRST && kind <= EXPR_BINARY_LAST) {
296 return sizes[EXPR_BINARY_FIRST];
298 assert(kind <= sizeof(sizes) / sizeof(sizes[0]));
299 assert(sizes[kind] != 0);
304 * Allocate a statement node of given kind and initialize all
307 static statement_t *allocate_statement_zero(statement_kind_t kind)
309 size_t size = get_statement_struct_size(kind);
310 statement_t *res = allocate_ast_zero(size);
312 res->base.kind = kind;
317 * Allocate an expression node of given kind and initialize all
320 static expression_t *allocate_expression_zero(expression_kind_t kind)
322 size_t size = get_expression_struct_size(kind);
323 expression_t *res = allocate_ast_zero(size);
325 res->base.kind = kind;
326 res->base.type = type_error_type;
331 * Creates a new invalid expression.
333 static expression_t *create_invalid_expression(void)
335 expression_t *expression = allocate_expression_zero(EXPR_INVALID);
336 expression->base.source_position = token.source_position;
341 * Creates a new invalid statement.
343 static statement_t *create_invalid_statement(void)
345 statement_t *statement = allocate_statement_zero(STATEMENT_INVALID);
346 statement->base.source_position = token.source_position;
351 * Allocate a new empty statement.
353 static statement_t *create_empty_statement(void)
355 statement_t *statement = allocate_statement_zero(STATEMENT_EMPTY);
356 statement->base.source_position = token.source_position;
361 * Returns the size of a type node.
363 * @param kind the type kind
365 static size_t get_type_struct_size(type_kind_t kind)
367 static const size_t sizes[] = {
368 [TYPE_ATOMIC] = sizeof(atomic_type_t),
369 [TYPE_COMPLEX] = sizeof(complex_type_t),
370 [TYPE_IMAGINARY] = sizeof(imaginary_type_t),
371 [TYPE_BITFIELD] = sizeof(bitfield_type_t),
372 [TYPE_COMPOUND_STRUCT] = sizeof(compound_type_t),
373 [TYPE_COMPOUND_UNION] = sizeof(compound_type_t),
374 [TYPE_ENUM] = sizeof(enum_type_t),
375 [TYPE_FUNCTION] = sizeof(function_type_t),
376 [TYPE_POINTER] = sizeof(pointer_type_t),
377 [TYPE_ARRAY] = sizeof(array_type_t),
378 [TYPE_BUILTIN] = sizeof(builtin_type_t),
379 [TYPE_TYPEDEF] = sizeof(typedef_type_t),
380 [TYPE_TYPEOF] = sizeof(typeof_type_t),
382 assert(sizeof(sizes) / sizeof(sizes[0]) == (int) TYPE_TYPEOF + 1);
383 assert(kind <= TYPE_TYPEOF);
384 assert(sizes[kind] != 0);
389 * Allocate a type node of given kind and initialize all
392 static type_t *allocate_type_zero(type_kind_t kind, const source_position_t *source_position)
394 size_t size = get_type_struct_size(kind);
395 type_t *res = obstack_alloc(type_obst, size);
396 memset(res, 0, size);
398 res->base.kind = kind;
399 res->base.source_position = *source_position;
404 * Returns the size of an initializer node.
406 * @param kind the initializer kind
408 static size_t get_initializer_size(initializer_kind_t kind)
410 static const size_t sizes[] = {
411 [INITIALIZER_VALUE] = sizeof(initializer_value_t),
412 [INITIALIZER_STRING] = sizeof(initializer_string_t),
413 [INITIALIZER_WIDE_STRING] = sizeof(initializer_wide_string_t),
414 [INITIALIZER_LIST] = sizeof(initializer_list_t),
415 [INITIALIZER_DESIGNATOR] = sizeof(initializer_designator_t)
417 assert(kind < sizeof(sizes) / sizeof(*sizes));
418 assert(sizes[kind] != 0);
423 * Allocate an initializer node of given kind and initialize all
426 static initializer_t *allocate_initializer_zero(initializer_kind_t kind)
428 initializer_t *result = allocate_ast_zero(get_initializer_size(kind));
435 * Free a type from the type obstack.
437 static void free_type(void *type)
439 obstack_free(type_obst, type);
443 * Returns the index of the top element of the environment stack.
445 static size_t environment_top(void)
447 return ARR_LEN(environment_stack);
451 * Returns the index of the top element of the label stack.
453 static size_t label_top(void)
455 return ARR_LEN(label_stack);
459 * Return the next token.
461 static inline void next_token(void)
463 token = lookahead_buffer[lookahead_bufpos];
464 lookahead_buffer[lookahead_bufpos] = lexer_token;
467 lookahead_bufpos = (lookahead_bufpos+1) % MAX_LOOKAHEAD;
470 print_token(stderr, &token);
471 fprintf(stderr, "\n");
476 * Return the next token with a given lookahead.
478 static inline const token_t *look_ahead(int num)
480 assert(num > 0 && num <= MAX_LOOKAHEAD);
481 int pos = (lookahead_bufpos+num-1) % MAX_LOOKAHEAD;
482 return &lookahead_buffer[pos];
486 * Adds a token to the token anchor set (a multi-set).
488 static void add_anchor_token(int token_type) {
489 assert(0 <= token_type && token_type < T_LAST_TOKEN);
490 ++token_anchor_set[token_type];
493 static int save_and_reset_anchor_state(int token_type) {
494 assert(0 <= token_type && token_type < T_LAST_TOKEN);
495 int count = token_anchor_set[token_type];
496 token_anchor_set[token_type] = 0;
500 static void restore_anchor_state(int token_type, int count) {
501 assert(0 <= token_type && token_type < T_LAST_TOKEN);
502 token_anchor_set[token_type] = count;
506 * Remove a token from the token anchor set (a multi-set).
508 static void rem_anchor_token(int token_type) {
509 assert(0 <= token_type && token_type < T_LAST_TOKEN);
510 --token_anchor_set[token_type];
513 static bool at_anchor(void) {
516 return token_anchor_set[token.type];
520 * Eat tokens until a matching token is found.
522 static void eat_until_matching_token(int type) {
523 unsigned parenthesis_count = 0;
524 unsigned brace_count = 0;
525 unsigned bracket_count = 0;
526 int end_token = type;
535 while(token.type != end_token ||
536 (parenthesis_count > 0 || brace_count > 0 || bracket_count > 0)) {
540 case '(': ++parenthesis_count; break;
541 case '{': ++brace_count; break;
542 case '[': ++bracket_count; break;
544 if(parenthesis_count > 0)
552 if(bracket_count > 0)
563 * Eat input tokens until an anchor is found.
565 static void eat_until_anchor(void) {
566 if(token.type == T_EOF)
568 while(token_anchor_set[token.type] == 0) {
569 if(token.type == '(' || token.type == '{' || token.type == '[')
570 eat_until_matching_token(token.type);
571 if(token.type == T_EOF)
577 static void eat_block(void) {
578 eat_until_matching_token('{');
579 if(token.type == '}')
584 * eat all token until a ';' is reached or a stop token is found.
586 static void eat_statement(void) {
587 eat_until_matching_token(';');
588 if(token.type == ';')
592 #define eat(token_type) do { assert(token.type == token_type); next_token(); } while(0)
595 * Report a parse error because an expected token was not found.
598 #if defined __GNUC__ && __GNUC__ >= 4
599 __attribute__((sentinel))
601 void parse_error_expected(const char *message, ...)
603 if(message != NULL) {
604 errorf(HERE, "%s", message);
607 va_start(ap, message);
608 errorf(HERE, "got %K, expected %#k", &token, &ap, ", ");
613 * Report a type error.
615 static void type_error(const char *msg, const source_position_t *source_position,
618 errorf(source_position, "%s, but found type '%T'", msg, type);
622 * Report an incompatible type.
624 static void type_error_incompatible(const char *msg,
625 const source_position_t *source_position, type_t *type1, type_t *type2)
627 errorf(source_position, "%s, incompatible types: '%T' - '%T'",
632 * Expect the the current token is the expected token.
633 * If not, generate an error, eat the current statement,
634 * and goto the end_error label.
636 #define expect(expected) \
638 if(UNLIKELY(token.type != (expected))) { \
639 parse_error_expected(NULL, (expected), NULL); \
640 add_anchor_token(expected); \
641 eat_until_anchor(); \
642 if (token.type == expected) \
644 rem_anchor_token(expected); \
650 static void set_scope(scope_t *new_scope)
653 scope->last_declaration = last_declaration;
657 last_declaration = new_scope->last_declaration;
661 * Search a symbol in a given namespace and returns its declaration or
662 * NULL if this symbol was not found.
664 static declaration_t *get_declaration(const symbol_t *const symbol,
665 const namespace_t namespc)
667 declaration_t *declaration = symbol->declaration;
668 for( ; declaration != NULL; declaration = declaration->symbol_next) {
669 if(declaration->namespc == namespc)
677 * pushs an environment_entry on the environment stack and links the
678 * corresponding symbol to the new entry
680 static void stack_push(stack_entry_t **stack_ptr, declaration_t *declaration)
682 symbol_t *symbol = declaration->symbol;
683 namespace_t namespc = (namespace_t) declaration->namespc;
685 /* replace/add declaration into declaration list of the symbol */
686 declaration_t *iter = symbol->declaration;
688 symbol->declaration = declaration;
690 declaration_t *iter_last = NULL;
691 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
692 /* replace an entry? */
693 if(iter->namespc == namespc) {
694 if(iter_last == NULL) {
695 symbol->declaration = declaration;
697 iter_last->symbol_next = declaration;
699 declaration->symbol_next = iter->symbol_next;
704 assert(iter_last->symbol_next == NULL);
705 iter_last->symbol_next = declaration;
709 /* remember old declaration */
711 entry.symbol = symbol;
712 entry.old_declaration = iter;
713 entry.namespc = (unsigned short) namespc;
714 ARR_APP1(stack_entry_t, *stack_ptr, entry);
717 static void environment_push(declaration_t *declaration)
719 assert(declaration->source_position.input_name != NULL);
720 assert(declaration->parent_scope != NULL);
721 stack_push(&environment_stack, declaration);
724 static void label_push(declaration_t *declaration)
726 declaration->parent_scope = ¤t_function->scope;
727 stack_push(&label_stack, declaration);
731 * pops symbols from the environment stack until @p new_top is the top element
733 static void stack_pop_to(stack_entry_t **stack_ptr, size_t new_top)
735 stack_entry_t *stack = *stack_ptr;
736 size_t top = ARR_LEN(stack);
739 assert(new_top <= top);
743 for(i = top; i > new_top; --i) {
744 stack_entry_t *entry = &stack[i - 1];
746 declaration_t *old_declaration = entry->old_declaration;
747 symbol_t *symbol = entry->symbol;
748 namespace_t namespc = (namespace_t)entry->namespc;
750 /* replace/remove declaration */
751 declaration_t *declaration = symbol->declaration;
752 assert(declaration != NULL);
753 if(declaration->namespc == namespc) {
754 if(old_declaration == NULL) {
755 symbol->declaration = declaration->symbol_next;
757 symbol->declaration = old_declaration;
760 declaration_t *iter_last = declaration;
761 declaration_t *iter = declaration->symbol_next;
762 for( ; iter != NULL; iter_last = iter, iter = iter->symbol_next) {
763 /* replace an entry? */
764 if(iter->namespc == namespc) {
765 assert(iter_last != NULL);
766 iter_last->symbol_next = old_declaration;
767 if(old_declaration != NULL) {
768 old_declaration->symbol_next = iter->symbol_next;
773 assert(iter != NULL);
777 ARR_SHRINKLEN(*stack_ptr, (int) new_top);
780 static void environment_pop_to(size_t new_top)
782 stack_pop_to(&environment_stack, new_top);
785 static void label_pop_to(size_t new_top)
787 stack_pop_to(&label_stack, new_top);
791 static int get_rank(const type_t *type)
793 assert(!is_typeref(type));
794 /* The C-standard allows promoting enums to int or unsigned int (see § 7.2.2
795 * and esp. footnote 108). However we can't fold constants (yet), so we
796 * can't decide whether unsigned int is possible, while int always works.
797 * (unsigned int would be preferable when possible... for stuff like
798 * struct { enum { ... } bla : 4; } ) */
799 if(type->kind == TYPE_ENUM)
800 return ATOMIC_TYPE_INT;
802 assert(type->kind == TYPE_ATOMIC);
803 return type->atomic.akind;
806 static type_t *promote_integer(type_t *type)
808 if(type->kind == TYPE_BITFIELD)
809 type = type->bitfield.base_type;
811 if(get_rank(type) < ATOMIC_TYPE_INT)
818 * Create a cast expression.
820 * @param expression the expression to cast
821 * @param dest_type the destination type
823 static expression_t *create_cast_expression(expression_t *expression,
826 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST_IMPLICIT);
828 cast->unary.value = expression;
829 cast->base.type = dest_type;
835 * Check if a given expression represents the 0 pointer constant.
837 static bool is_null_pointer_constant(const expression_t *expression)
839 /* skip void* cast */
840 if(expression->kind == EXPR_UNARY_CAST
841 || expression->kind == EXPR_UNARY_CAST_IMPLICIT) {
842 expression = expression->unary.value;
845 /* TODO: not correct yet, should be any constant integer expression
846 * which evaluates to 0 */
847 if (expression->kind != EXPR_CONST)
850 type_t *const type = skip_typeref(expression->base.type);
851 if (!is_type_integer(type))
854 return expression->conste.v.int_value == 0;
858 * Create an implicit cast expression.
860 * @param expression the expression to cast
861 * @param dest_type the destination type
863 static expression_t *create_implicit_cast(expression_t *expression,
866 type_t *const source_type = expression->base.type;
868 if (source_type == dest_type)
871 return create_cast_expression(expression, dest_type);
874 /** Implements the rules from § 6.5.16.1 */
875 static type_t *semantic_assign(type_t *orig_type_left,
876 const expression_t *const right,
878 const source_position_t *source_position)
880 type_t *const orig_type_right = right->base.type;
881 type_t *const type_left = skip_typeref(orig_type_left);
882 type_t *const type_right = skip_typeref(orig_type_right);
884 if(is_type_pointer(type_left)) {
885 if(is_null_pointer_constant(right)) {
886 return orig_type_left;
887 } else if(is_type_pointer(type_right)) {
888 type_t *points_to_left
889 = skip_typeref(type_left->pointer.points_to);
890 type_t *points_to_right
891 = skip_typeref(type_right->pointer.points_to);
893 /* the left type has all qualifiers from the right type */
894 unsigned missing_qualifiers
895 = points_to_right->base.qualifiers & ~points_to_left->base.qualifiers;
896 if(missing_qualifiers != 0) {
897 errorf(source_position,
898 "destination type '%T' in %s from type '%T' lacks qualifiers '%Q' in pointed-to type", type_left, context, type_right, missing_qualifiers);
899 return orig_type_left;
902 points_to_left = get_unqualified_type(points_to_left);
903 points_to_right = get_unqualified_type(points_to_right);
905 if (is_type_atomic(points_to_left, ATOMIC_TYPE_VOID) ||
906 is_type_atomic(points_to_right, ATOMIC_TYPE_VOID)) {
907 return orig_type_left;
910 if (!types_compatible(points_to_left, points_to_right)) {
911 warningf(source_position,
912 "destination type '%T' in %s is incompatible with '%E' of type '%T'",
913 orig_type_left, context, right, orig_type_right);
916 return orig_type_left;
917 } else if(is_type_integer(type_right)) {
918 warningf(source_position,
919 "%s makes pointer '%T' from integer '%T' without a cast",
920 context, orig_type_left, orig_type_right);
921 return orig_type_left;
923 } else if ((is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) ||
924 (is_type_atomic(type_left, ATOMIC_TYPE_BOOL)
925 && is_type_pointer(type_right))) {
926 return orig_type_left;
927 } else if ((is_type_compound(type_left) && is_type_compound(type_right))
928 || (is_type_builtin(type_left) && is_type_builtin(type_right))) {
929 type_t *const unqual_type_left = get_unqualified_type(type_left);
930 type_t *const unqual_type_right = get_unqualified_type(type_right);
931 if (types_compatible(unqual_type_left, unqual_type_right)) {
932 return orig_type_left;
934 } else if (is_type_integer(type_left) && is_type_pointer(type_right)) {
935 warningf(source_position,
936 "%s makes integer '%T' from pointer '%T' without a cast",
937 context, orig_type_left, orig_type_right);
938 return orig_type_left;
941 if (!is_type_valid(type_left))
944 if (!is_type_valid(type_right))
945 return orig_type_right;
950 static expression_t *parse_constant_expression(void)
952 /* start parsing at precedence 7 (conditional expression) */
953 expression_t *result = parse_sub_expression(7);
955 if(!is_constant_expression(result)) {
956 errorf(&result->base.source_position,
957 "expression '%E' is not constant\n", result);
963 static expression_t *parse_assignment_expression(void)
965 /* start parsing at precedence 2 (assignment expression) */
966 return parse_sub_expression(2);
969 static type_t *make_global_typedef(const char *name, type_t *type)
971 symbol_t *const symbol = symbol_table_insert(name);
973 declaration_t *const declaration = allocate_declaration_zero();
974 declaration->namespc = NAMESPACE_NORMAL;
975 declaration->storage_class = STORAGE_CLASS_TYPEDEF;
976 declaration->declared_storage_class = STORAGE_CLASS_TYPEDEF;
977 declaration->type = type;
978 declaration->symbol = symbol;
979 declaration->source_position = builtin_source_position;
981 record_declaration(declaration);
983 type_t *typedef_type = allocate_type_zero(TYPE_TYPEDEF, &builtin_source_position);
984 typedef_type->typedeft.declaration = declaration;
989 static string_t parse_string_literals(void)
991 assert(token.type == T_STRING_LITERAL);
992 string_t result = token.v.string;
996 while (token.type == T_STRING_LITERAL) {
997 result = concat_strings(&result, &token.v.string);
1004 static const char *gnu_attribute_names[GNU_AK_LAST] = {
1005 [GNU_AK_CONST] = "const",
1006 [GNU_AK_VOLATILE] = "volatile",
1007 [GNU_AK_CDECL] = "cdecl",
1008 [GNU_AK_STDCALL] = "stdcall",
1009 [GNU_AK_FASTCALL] = "fastcall",
1010 [GNU_AK_DEPRECATED] = "deprecated",
1011 [GNU_AK_NOINLINE] = "noinline",
1012 [GNU_AK_NORETURN] = "noreturn",
1013 [GNU_AK_NAKED] = "naked",
1014 [GNU_AK_PURE] = "pure",
1015 [GNU_AK_ALWAYS_INLINE] = "always_inline",
1016 [GNU_AK_MALLOC] = "malloc",
1017 [GNU_AK_WEAK] = "weak",
1018 [GNU_AK_CONSTRUCTOR] = "constructor",
1019 [GNU_AK_DESTRUCTOR] = "destructor",
1020 [GNU_AK_NOTHROW] = "nothrow",
1021 [GNU_AK_TRANSPARENT_UNION] = "transparent_union",
1022 [GNU_AK_COMMON] = "coommon",
1023 [GNU_AK_NOCOMMON] = "nocommon",
1024 [GNU_AK_PACKED] = "packed",
1025 [GNU_AK_SHARED] = "shared",
1026 [GNU_AK_NOTSHARED] = "notshared",
1027 [GNU_AK_USED] = "used",
1028 [GNU_AK_UNUSED] = "unused",
1029 [GNU_AK_NO_INSTRUMENT_FUNCTION] = "no_instrument_function",
1030 [GNU_AK_WARN_UNUSED_RESULT] = "warn_unused_result",
1031 [GNU_AK_LONGCALL] = "longcall",
1032 [GNU_AK_SHORTCALL] = "shortcall",
1033 [GNU_AK_LONG_CALL] = "long_call",
1034 [GNU_AK_SHORT_CALL] = "short_call",
1035 [GNU_AK_FUNCTION_VECTOR] = "function_vector",
1036 [GNU_AK_INTERRUPT] = "interrupt",
1037 [GNU_AK_INTERRUPT_HANDLER] = "interrupt_handler",
1038 [GNU_AK_NMI_HANDLER] = "nmi_handler",
1039 [GNU_AK_NESTING] = "nesting",
1040 [GNU_AK_NEAR] = "near",
1041 [GNU_AK_FAR] = "far",
1042 [GNU_AK_SIGNAL] = "signal",
1043 [GNU_AK_EIGTHBIT_DATA] = "eightbit_data",
1044 [GNU_AK_TINY_DATA] = "tiny_data",
1045 [GNU_AK_SAVEALL] = "saveall",
1046 [GNU_AK_FLATTEN] = "flatten",
1047 [GNU_AK_SSEREGPARM] = "sseregparm",
1048 [GNU_AK_EXTERNALLY_VISIBLE] = "externally_visible",
1049 [GNU_AK_RETURN_TWICE] = "return_twice",
1050 [GNU_AK_MAY_ALIAS] = "may_alias",
1051 [GNU_AK_MS_STRUCT] = "ms_struct",
1052 [GNU_AK_GCC_STRUCT] = "gcc_struct",
1053 [GNU_AK_DLLIMPORT] = "dllimport",
1054 [GNU_AK_DLLEXPORT] = "dllexport",
1055 [GNU_AK_ALIGNED] = "aligned",
1056 [GNU_AK_ALIAS] = "alias",
1057 [GNU_AK_SECTION] = "section",
1058 [GNU_AK_FORMAT] = "format",
1059 [GNU_AK_FORMAT_ARG] = "format_arg",
1060 [GNU_AK_WEAKREF] = "weakref",
1061 [GNU_AK_NONNULL] = "nonnull",
1062 [GNU_AK_TLS_MODEL] = "tls_model",
1063 [GNU_AK_VISIBILITY] = "visibility",
1064 [GNU_AK_REGPARM] = "regparm",
1065 [GNU_AK_MODE] = "mode",
1066 [GNU_AK_MODEL] = "model",
1067 [GNU_AK_TRAP_EXIT] = "trap_exit",
1068 [GNU_AK_SP_SWITCH] = "sp_switch",
1069 [GNU_AK_SENTINEL] = "sentinel"
1073 * compare two string, ignoring double underscores on the second.
1075 static int strcmp_underscore(const char *s1, const char *s2) {
1076 if(s2[0] == '_' && s2[1] == '_') {
1078 size_t l1 = strlen(s1);
1079 if(l1 + 2 != strlen(s2)) {
1083 return strncmp(s1, s2, l1);
1085 return strcmp(s1, s2);
1089 * Allocate a new gnu temporal attribute.
1091 static gnu_attribute_t *allocate_gnu_attribute(gnu_attribute_kind_t kind) {
1092 gnu_attribute_t *attribute = obstack_alloc(&temp_obst, sizeof(*attribute));
1093 attribute->kind = kind;
1094 attribute->next = NULL;
1095 attribute->invalid = false;
1096 attribute->have_arguments = false;
1103 * parse one constant expression argument.
1105 static void parse_gnu_attribute_const_arg(gnu_attribute_t *attribute) {
1106 expression_t *expression;
1107 add_anchor_token(')');
1108 expression = parse_constant_expression();
1109 rem_anchor_token(')');
1114 attribute->invalid = true;
1118 * parse a list of constant expressions arguments.
1120 static void parse_gnu_attribute_const_arg_list(gnu_attribute_t *attribute) {
1121 expression_t *expression;
1122 add_anchor_token(')');
1123 add_anchor_token(',');
1125 expression = parse_constant_expression();
1126 if(token.type != ',')
1130 rem_anchor_token(',');
1131 rem_anchor_token(')');
1136 attribute->invalid = true;
1140 * parse one string literal argument.
1142 static void parse_gnu_attribute_string_arg(gnu_attribute_t *attribute,
1145 add_anchor_token('(');
1146 if(token.type != T_STRING_LITERAL) {
1147 parse_error_expected("while parsing attribute directive",
1148 T_STRING_LITERAL, NULL);
1151 *string = parse_string_literals();
1152 rem_anchor_token('(');
1156 attribute->invalid = true;
1160 * parse one tls model.
1162 static void parse_gnu_attribute_tls_model_arg(gnu_attribute_t *attribute) {
1163 static const char *tls_models[] = {
1169 string_t string = { NULL, 0 };
1170 parse_gnu_attribute_string_arg(attribute, &string);
1171 if(string.begin != NULL) {
1172 for(size_t i = 0; i < 4; ++i) {
1173 if(strcmp(tls_models[i], string.begin) == 0) {
1174 attribute->u.value = i;
1179 errorf(HERE, "'%s' is an unrecognized tls model", string.begin);
1180 attribute->invalid = true;
1184 * parse one tls model.
1186 static void parse_gnu_attribute_visibility_arg(gnu_attribute_t *attribute) {
1187 static const char *visibilities[] = {
1193 string_t string = { NULL, 0 };
1194 parse_gnu_attribute_string_arg(attribute, &string);
1195 if(string.begin != NULL) {
1196 for(size_t i = 0; i < 4; ++i) {
1197 if(strcmp(visibilities[i], string.begin) == 0) {
1198 attribute->u.value = i;
1203 errorf(HERE, "'%s' is an unrecognized visibility", string.begin);
1204 attribute->invalid = true;
1208 * parse one (code) model.
1210 static void parse_gnu_attribute_model_arg(gnu_attribute_t *attribute) {
1211 static const char *visibilities[] = {
1216 string_t string = { NULL, 0 };
1217 parse_gnu_attribute_string_arg(attribute, &string);
1218 if(string.begin != NULL) {
1219 for(int i = 0; i < 3; ++i) {
1220 if(strcmp(visibilities[i], string.begin) == 0) {
1221 attribute->u.value = i;
1226 errorf(HERE, "'%s' is an unrecognized model", string.begin);
1227 attribute->invalid = true;
1230 static void parse_gnu_attribute_mode_arg(gnu_attribute_t *attribute)
1232 /* TODO: find out what is allowed here... */
1234 /* at least: byte, word, pointer, list of machine modes
1235 * __XXX___ is interpreted as XXX */
1236 add_anchor_token(')');
1237 expect(T_IDENTIFIER);
1238 rem_anchor_token(')');
1242 attribute->invalid = true;
1246 * parse one interrupt argument.
1248 static void parse_gnu_attribute_interrupt_arg(gnu_attribute_t *attribute) {
1249 static const char *interrupts[] = {
1256 string_t string = { NULL, 0 };
1257 parse_gnu_attribute_string_arg(attribute, &string);
1258 if(string.begin != NULL) {
1259 for(size_t i = 0; i < 5; ++i) {
1260 if(strcmp(interrupts[i], string.begin) == 0) {
1261 attribute->u.value = i;
1266 errorf(HERE, "'%s' is an interrupt", string.begin);
1267 attribute->invalid = true;
1271 * parse ( identifier, const expression, const expression )
1273 static void parse_gnu_attribute_format_args(gnu_attribute_t *attribute) {
1274 static const char *format_names[] = {
1282 if(token.type != T_IDENTIFIER) {
1283 parse_error_expected("while parsing format attribute directive", T_IDENTIFIER, NULL);
1286 const char *name = token.v.symbol->string;
1287 for(i = 0; i < 4; ++i) {
1288 if(strcmp_underscore(format_names[i], name) == 0)
1292 if(warning.attribute)
1293 warningf(HERE, "'%s' is an unrecognized format function type", name);
1298 add_anchor_token(')');
1299 add_anchor_token(',');
1300 parse_constant_expression();
1301 rem_anchor_token(',');
1302 rem_anchor_token('(');
1305 add_anchor_token(')');
1306 parse_constant_expression();
1307 rem_anchor_token('(');
1311 attribute->u.value = true;
1315 * Parse one GNU attribute.
1317 * Note that attribute names can be specified WITH or WITHOUT
1318 * double underscores, ie const or __const__.
1320 * The following attributes are parsed without arguments
1345 * no_instrument_function
1346 * warn_unused_result
1363 * externally_visible
1371 * The following attributes are parsed with arguments
1372 * aligned( const expression )
1373 * alias( string literal )
1374 * section( string literal )
1375 * format( identifier, const expression, const expression )
1376 * format_arg( const expression )
1377 * tls_model( string literal )
1378 * visibility( string literal )
1379 * regparm( const expression )
1380 * model( string leteral )
1381 * trap_exit( const expression )
1382 * sp_switch( string literal )
1384 * The following attributes might have arguments
1385 * weak_ref( string literal )
1386 * non_null( const expression // ',' )
1387 * interrupt( string literal )
1388 * sentinel( constant expression )
1390 static void parse_gnu_attribute(gnu_attribute_t **attributes)
1392 gnu_attribute_t *head = *attributes;
1393 gnu_attribute_t *last = *attributes;
1394 gnu_attribute_t *attribute;
1396 eat(T___attribute__);
1400 if(token.type != ')') {
1401 /* find the end of the list */
1403 while(last->next != NULL)
1407 /* non-empty attribute list */
1410 if(token.type == T_const) {
1412 } else if(token.type == T_volatile) {
1414 } else if(token.type == T_cdecl) {
1415 /* __attribute__((cdecl)), WITH ms mode */
1417 } else if(token.type != T_IDENTIFIER) {
1418 parse_error_expected("while parsing GNU attribute", T_IDENTIFIER, NULL);
1421 const symbol_t *sym = token.v.symbol;
1426 for(i = 0; i < GNU_AK_LAST; ++i) {
1427 if(strcmp_underscore(gnu_attribute_names[i], name) == 0)
1430 gnu_attribute_kind_t kind = (gnu_attribute_kind_t)i;
1433 if(kind == GNU_AK_LAST) {
1434 if(warning.attribute)
1435 warningf(HERE, "'%s' attribute directive ignored", name);
1437 /* skip possible arguments */
1438 if(token.type == '(') {
1439 eat_until_matching_token(')');
1442 /* check for arguments */
1443 attribute = allocate_gnu_attribute(kind);
1444 if(token.type == '(') {
1446 if(token.type == ')') {
1447 /* empty args are allowed */
1450 attribute->have_arguments = true;
1455 case GNU_AK_VOLATILE:
1457 case GNU_AK_STDCALL:
1458 case GNU_AK_FASTCALL:
1459 case GNU_AK_DEPRECATED:
1460 case GNU_AK_NOINLINE:
1461 case GNU_AK_NORETURN:
1464 case GNU_AK_ALWAYS_INLINE:
1467 case GNU_AK_CONSTRUCTOR:
1468 case GNU_AK_DESTRUCTOR:
1469 case GNU_AK_NOTHROW:
1470 case GNU_AK_TRANSPARENT_UNION:
1472 case GNU_AK_NOCOMMON:
1475 case GNU_AK_NOTSHARED:
1478 case GNU_AK_NO_INSTRUMENT_FUNCTION:
1479 case GNU_AK_WARN_UNUSED_RESULT:
1480 case GNU_AK_LONGCALL:
1481 case GNU_AK_SHORTCALL:
1482 case GNU_AK_LONG_CALL:
1483 case GNU_AK_SHORT_CALL:
1484 case GNU_AK_FUNCTION_VECTOR:
1485 case GNU_AK_INTERRUPT_HANDLER:
1486 case GNU_AK_NMI_HANDLER:
1487 case GNU_AK_NESTING:
1491 case GNU_AK_EIGTHBIT_DATA:
1492 case GNU_AK_TINY_DATA:
1493 case GNU_AK_SAVEALL:
1494 case GNU_AK_FLATTEN:
1495 case GNU_AK_SSEREGPARM:
1496 case GNU_AK_EXTERNALLY_VISIBLE:
1497 case GNU_AK_RETURN_TWICE:
1498 case GNU_AK_MAY_ALIAS:
1499 case GNU_AK_MS_STRUCT:
1500 case GNU_AK_GCC_STRUCT:
1501 case GNU_AK_DLLIMPORT:
1502 case GNU_AK_DLLEXPORT:
1503 if(attribute->have_arguments) {
1504 /* should have no arguments */
1505 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1506 eat_until_matching_token('(');
1507 /* we have already consumed '(', so we stop before ')', eat it */
1509 attribute->invalid = true;
1513 case GNU_AK_ALIGNED:
1514 case GNU_AK_FORMAT_ARG:
1515 case GNU_AK_REGPARM:
1516 case GNU_AK_TRAP_EXIT:
1517 if(!attribute->have_arguments) {
1518 /* should have arguments */
1519 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1520 attribute->invalid = true;
1522 parse_gnu_attribute_const_arg(attribute);
1525 case GNU_AK_SECTION:
1526 case GNU_AK_SP_SWITCH:
1527 if(!attribute->have_arguments) {
1528 /* should have arguments */
1529 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1530 attribute->invalid = true;
1532 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1535 if(!attribute->have_arguments) {
1536 /* should have arguments */
1537 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1538 attribute->invalid = true;
1540 parse_gnu_attribute_format_args(attribute);
1542 case GNU_AK_WEAKREF:
1543 /* may have one string argument */
1544 if(attribute->have_arguments)
1545 parse_gnu_attribute_string_arg(attribute, &attribute->u.string);
1547 case GNU_AK_NONNULL:
1548 if(attribute->have_arguments)
1549 parse_gnu_attribute_const_arg_list(attribute);
1551 case GNU_AK_TLS_MODEL:
1552 if(!attribute->have_arguments) {
1553 /* should have arguments */
1554 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1556 parse_gnu_attribute_tls_model_arg(attribute);
1558 case GNU_AK_VISIBILITY:
1559 if(!attribute->have_arguments) {
1560 /* should have arguments */
1561 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1563 parse_gnu_attribute_visibility_arg(attribute);
1566 if(!attribute->have_arguments) {
1567 /* should have arguments */
1568 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1570 parse_gnu_attribute_model_arg(attribute);
1574 if(!attribute->have_arguments) {
1575 /* should have arguments */
1576 errorf(HERE, "wrong number of arguments specified for '%s' attribute", name);
1578 parse_gnu_attribute_mode_arg(attribute);
1581 case GNU_AK_INTERRUPT:
1582 /* may have one string argument */
1583 if(attribute->have_arguments)
1584 parse_gnu_attribute_interrupt_arg(attribute);
1586 case GNU_AK_SENTINEL:
1587 /* may have one string argument */
1588 if(attribute->have_arguments)
1589 parse_gnu_attribute_const_arg(attribute);
1592 /* already handled */
1596 if(attribute != NULL) {
1598 last->next = attribute;
1601 head = last = attribute;
1605 if(token.type != ',')
1617 * Parse GNU attributes.
1619 static void parse_attributes(gnu_attribute_t **attributes)
1622 switch(token.type) {
1623 case T___attribute__: {
1624 parse_gnu_attribute(attributes);
1630 if(token.type != T_STRING_LITERAL) {
1631 parse_error_expected("while parsing assembler attribute",
1632 T_STRING_LITERAL, NULL);
1633 eat_until_matching_token('(');
1636 parse_string_literals();
1641 goto attributes_finished;
1645 attributes_finished:
1650 static designator_t *parse_designation(void)
1652 designator_t *result = NULL;
1653 designator_t *last = NULL;
1656 designator_t *designator;
1657 switch(token.type) {
1659 designator = allocate_ast_zero(sizeof(designator[0]));
1660 designator->source_position = token.source_position;
1662 add_anchor_token(']');
1663 designator->array_index = parse_constant_expression();
1664 rem_anchor_token(']');
1668 designator = allocate_ast_zero(sizeof(designator[0]));
1669 designator->source_position = token.source_position;
1671 if(token.type != T_IDENTIFIER) {
1672 parse_error_expected("while parsing designator",
1673 T_IDENTIFIER, NULL);
1676 designator->symbol = token.v.symbol;
1684 assert(designator != NULL);
1686 last->next = designator;
1688 result = designator;
1696 static initializer_t *initializer_from_string(array_type_t *type,
1697 const string_t *const string)
1699 /* TODO: check len vs. size of array type */
1702 initializer_t *initializer = allocate_initializer_zero(INITIALIZER_STRING);
1703 initializer->string.string = *string;
1708 static initializer_t *initializer_from_wide_string(array_type_t *const type,
1709 wide_string_t *const string)
1711 /* TODO: check len vs. size of array type */
1714 initializer_t *const initializer =
1715 allocate_initializer_zero(INITIALIZER_WIDE_STRING);
1716 initializer->wide_string.string = *string;
1722 * Build an initializer from a given expression.
1724 static initializer_t *initializer_from_expression(type_t *orig_type,
1725 expression_t *expression)
1727 /* TODO check that expression is a constant expression */
1729 /* § 6.7.8.14/15 char array may be initialized by string literals */
1730 type_t *type = skip_typeref(orig_type);
1731 type_t *expr_type_orig = expression->base.type;
1732 type_t *expr_type = skip_typeref(expr_type_orig);
1733 if (is_type_array(type) && expr_type->kind == TYPE_POINTER) {
1734 array_type_t *const array_type = &type->array;
1735 type_t *const element_type = skip_typeref(array_type->element_type);
1737 if (element_type->kind == TYPE_ATOMIC) {
1738 atomic_type_kind_t akind = element_type->atomic.akind;
1739 switch (expression->kind) {
1740 case EXPR_STRING_LITERAL:
1741 if (akind == ATOMIC_TYPE_CHAR
1742 || akind == ATOMIC_TYPE_SCHAR
1743 || akind == ATOMIC_TYPE_UCHAR) {
1744 return initializer_from_string(array_type,
1745 &expression->string.value);
1748 case EXPR_WIDE_STRING_LITERAL: {
1749 type_t *bare_wchar_type = skip_typeref(type_wchar_t);
1750 if (get_unqualified_type(element_type) == bare_wchar_type) {
1751 return initializer_from_wide_string(array_type,
1752 &expression->wide_string.value);
1762 type_t *const res_type = semantic_assign(type, expression, "initializer",
1763 &expression->base.source_position);
1764 if (res_type == NULL)
1767 initializer_t *const result = allocate_initializer_zero(INITIALIZER_VALUE);
1768 result->value.value = create_implicit_cast(expression, res_type);
1774 * Checks if a given expression can be used as an constant initializer.
1776 static bool is_initializer_constant(const expression_t *expression)
1778 return is_constant_expression(expression)
1779 || is_address_constant(expression);
1783 * Parses an scalar initializer.
1785 * § 6.7.8.11; eat {} without warning
1787 static initializer_t *parse_scalar_initializer(type_t *type,
1788 bool must_be_constant)
1790 /* there might be extra {} hierarchies */
1792 while(token.type == '{') {
1795 warningf(HERE, "extra curly braces around scalar initializer");
1800 expression_t *expression = parse_assignment_expression();
1801 if(must_be_constant && !is_initializer_constant(expression)) {
1802 errorf(&expression->base.source_position,
1803 "Initialisation expression '%E' is not constant\n",
1807 initializer_t *initializer = initializer_from_expression(type, expression);
1809 if(initializer == NULL) {
1810 errorf(&expression->base.source_position,
1811 "expression '%E' (type '%T') doesn't match expected type '%T'",
1812 expression, expression->base.type, type);
1817 bool additional_warning_displayed = false;
1819 if(token.type == ',') {
1822 if(token.type != '}') {
1823 if(!additional_warning_displayed) {
1824 warningf(HERE, "additional elements in scalar initializer");
1825 additional_warning_displayed = true;
1836 * An entry in the type path.
1838 typedef struct type_path_entry_t type_path_entry_t;
1839 struct type_path_entry_t {
1840 type_t *type; /**< the upper top type. restored to path->top_tye if this entry is popped. */
1842 size_t index; /**< For array types: the current index. */
1843 declaration_t *compound_entry; /**< For compound types: the current declaration. */
1848 * A type path expression a position inside compound or array types.
1850 typedef struct type_path_t type_path_t;
1851 struct type_path_t {
1852 type_path_entry_t *path; /**< An flexible array containing the current path. */
1853 type_t *top_type; /**< type of the element the path points */
1854 size_t max_index; /**< largest index in outermost array */
1858 * Prints a type path for debugging.
1860 static __attribute__((unused)) void debug_print_type_path(
1861 const type_path_t *path)
1863 size_t len = ARR_LEN(path->path);
1865 for(size_t i = 0; i < len; ++i) {
1866 const type_path_entry_t *entry = & path->path[i];
1868 type_t *type = skip_typeref(entry->type);
1869 if(is_type_compound(type)) {
1870 /* in gcc mode structs can have no members */
1871 if(entry->v.compound_entry == NULL) {
1875 fprintf(stderr, ".%s", entry->v.compound_entry->symbol->string);
1876 } else if(is_type_array(type)) {
1877 fprintf(stderr, "[%zd]", entry->v.index);
1879 fprintf(stderr, "-INVALID-");
1882 if(path->top_type != NULL) {
1883 fprintf(stderr, " (");
1884 print_type(path->top_type);
1885 fprintf(stderr, ")");
1890 * Return the top type path entry, ie. in a path
1891 * (type).a.b returns the b.
1893 static type_path_entry_t *get_type_path_top(const type_path_t *path)
1895 size_t len = ARR_LEN(path->path);
1897 return &path->path[len-1];
1901 * Enlarge the type path by an (empty) element.
1903 static type_path_entry_t *append_to_type_path(type_path_t *path)
1905 size_t len = ARR_LEN(path->path);
1906 ARR_RESIZE(type_path_entry_t, path->path, len+1);
1908 type_path_entry_t *result = & path->path[len];
1909 memset(result, 0, sizeof(result[0]));
1914 * Descending into a sub-type. Enter the scope of the current
1917 static void descend_into_subtype(type_path_t *path)
1919 type_t *orig_top_type = path->top_type;
1920 type_t *top_type = skip_typeref(orig_top_type);
1922 assert(is_type_compound(top_type) || is_type_array(top_type));
1924 type_path_entry_t *top = append_to_type_path(path);
1925 top->type = top_type;
1927 if(is_type_compound(top_type)) {
1928 declaration_t *declaration = top_type->compound.declaration;
1929 declaration_t *entry = declaration->scope.declarations;
1930 top->v.compound_entry = entry;
1933 path->top_type = entry->type;
1935 path->top_type = NULL;
1938 assert(is_type_array(top_type));
1941 path->top_type = top_type->array.element_type;
1946 * Pop an entry from the given type path, ie. returning from
1947 * (type).a.b to (type).a
1949 static void ascend_from_subtype(type_path_t *path)
1951 type_path_entry_t *top = get_type_path_top(path);
1953 path->top_type = top->type;
1955 size_t len = ARR_LEN(path->path);
1956 ARR_RESIZE(type_path_entry_t, path->path, len-1);
1960 * Pop entries from the given type path until the given
1961 * path level is reached.
1963 static void ascend_to(type_path_t *path, size_t top_path_level)
1965 size_t len = ARR_LEN(path->path);
1967 while(len > top_path_level) {
1968 ascend_from_subtype(path);
1969 len = ARR_LEN(path->path);
1973 static bool walk_designator(type_path_t *path, const designator_t *designator,
1974 bool used_in_offsetof)
1976 for( ; designator != NULL; designator = designator->next) {
1977 type_path_entry_t *top = get_type_path_top(path);
1978 type_t *orig_type = top->type;
1980 type_t *type = skip_typeref(orig_type);
1982 if(designator->symbol != NULL) {
1983 symbol_t *symbol = designator->symbol;
1984 if(!is_type_compound(type)) {
1985 if(is_type_valid(type)) {
1986 errorf(&designator->source_position,
1987 "'.%Y' designator used for non-compound type '%T'",
1993 declaration_t *declaration = type->compound.declaration;
1994 declaration_t *iter = declaration->scope.declarations;
1995 for( ; iter != NULL; iter = iter->next) {
1996 if(iter->symbol == symbol) {
2001 errorf(&designator->source_position,
2002 "'%T' has no member named '%Y'", orig_type, symbol);
2005 if(used_in_offsetof) {
2006 type_t *real_type = skip_typeref(iter->type);
2007 if(real_type->kind == TYPE_BITFIELD) {
2008 errorf(&designator->source_position,
2009 "offsetof designator '%Y' may not specify bitfield",
2015 top->type = orig_type;
2016 top->v.compound_entry = iter;
2017 orig_type = iter->type;
2019 expression_t *array_index = designator->array_index;
2020 assert(designator->array_index != NULL);
2022 if(!is_type_array(type)) {
2023 if(is_type_valid(type)) {
2024 errorf(&designator->source_position,
2025 "[%E] designator used for non-array type '%T'",
2026 array_index, orig_type);
2030 if(!is_type_valid(array_index->base.type)) {
2034 long index = fold_constant(array_index);
2035 if(!used_in_offsetof) {
2037 errorf(&designator->source_position,
2038 "array index [%E] must be positive", array_index);
2041 if(type->array.size_constant == true) {
2042 long array_size = type->array.size;
2043 if(index >= array_size) {
2044 errorf(&designator->source_position,
2045 "designator [%E] (%d) exceeds array size %d",
2046 array_index, index, array_size);
2052 top->type = orig_type;
2053 top->v.index = (size_t) index;
2054 orig_type = type->array.element_type;
2056 path->top_type = orig_type;
2058 if(designator->next != NULL) {
2059 descend_into_subtype(path);
2068 static void advance_current_object(type_path_t *path, size_t top_path_level)
2070 type_path_entry_t *top = get_type_path_top(path);
2072 type_t *type = skip_typeref(top->type);
2073 if(is_type_union(type)) {
2074 /* in unions only the first element is initialized */
2075 top->v.compound_entry = NULL;
2076 } else if(is_type_struct(type)) {
2077 declaration_t *entry = top->v.compound_entry;
2079 entry = entry->next;
2080 top->v.compound_entry = entry;
2082 path->top_type = entry->type;
2086 assert(is_type_array(type));
2090 if(!type->array.size_constant || top->v.index < type->array.size) {
2095 /* we're past the last member of the current sub-aggregate, try if we
2096 * can ascend in the type hierarchy and continue with another subobject */
2097 size_t len = ARR_LEN(path->path);
2099 if(len > top_path_level) {
2100 ascend_from_subtype(path);
2101 advance_current_object(path, top_path_level);
2103 path->top_type = NULL;
2108 * skip until token is found.
2110 static void skip_until(int type) {
2111 while(token.type != type) {
2112 if(token.type == T_EOF)
2119 * skip any {...} blocks until a closing bracket is reached.
2121 static void skip_initializers(void)
2123 if(token.type == '{')
2126 while(token.type != '}') {
2127 if(token.type == T_EOF)
2129 if(token.type == '{') {
2137 static initializer_t *create_empty_initializer(void)
2139 static initializer_t empty_initializer
2140 = { .list = { { INITIALIZER_LIST }, 0 } };
2141 return &empty_initializer;
2145 * Parse a part of an initialiser for a struct or union,
2147 static initializer_t *parse_sub_initializer(type_path_t *path,
2148 type_t *outer_type, size_t top_path_level,
2149 parse_initializer_env_t *env)
2151 if(token.type == '}') {
2152 /* empty initializer */
2153 return create_empty_initializer();
2156 type_t *orig_type = path->top_type;
2157 type_t *type = NULL;
2159 if (orig_type == NULL) {
2160 /* We are initializing an empty compound. */
2162 type = skip_typeref(orig_type);
2164 /* we can't do usefull stuff if we didn't even parse the type. Skip the
2165 * initializers in this case. */
2166 if(!is_type_valid(type)) {
2167 skip_initializers();
2168 return create_empty_initializer();
2172 initializer_t **initializers = NEW_ARR_F(initializer_t*, 0);
2175 designator_t *designator = NULL;
2176 if(token.type == '.' || token.type == '[') {
2177 designator = parse_designation();
2179 /* reset path to toplevel, evaluate designator from there */
2180 ascend_to(path, top_path_level);
2181 if(!walk_designator(path, designator, false)) {
2182 /* can't continue after designation error */
2186 initializer_t *designator_initializer
2187 = allocate_initializer_zero(INITIALIZER_DESIGNATOR);
2188 designator_initializer->designator.designator = designator;
2189 ARR_APP1(initializer_t*, initializers, designator_initializer);
2194 if(token.type == '{') {
2195 if(type != NULL && is_type_scalar(type)) {
2196 sub = parse_scalar_initializer(type, env->must_be_constant);
2200 if (env->declaration != NULL)
2201 errorf(HERE, "extra brace group at end of initializer for '%Y'",
2202 env->declaration->symbol);
2204 errorf(HERE, "extra brace group at end of initializer");
2206 descend_into_subtype(path);
2208 add_anchor_token('}');
2209 sub = parse_sub_initializer(path, orig_type, top_path_level+1,
2211 rem_anchor_token('}');
2214 ascend_from_subtype(path);
2218 goto error_parse_next;
2222 /* must be an expression */
2223 expression_t *expression = parse_assignment_expression();
2225 if(env->must_be_constant && !is_initializer_constant(expression)) {
2226 errorf(&expression->base.source_position,
2227 "Initialisation expression '%E' is not constant\n",
2232 /* we are already outside, ... */
2236 /* handle { "string" } special case */
2237 if((expression->kind == EXPR_STRING_LITERAL
2238 || expression->kind == EXPR_WIDE_STRING_LITERAL)
2239 && outer_type != NULL) {
2240 sub = initializer_from_expression(outer_type, expression);
2242 if(token.type == ',') {
2245 if(token.type != '}') {
2246 warningf(HERE, "excessive elements in initializer for type '%T'",
2249 /* TODO: eat , ... */
2254 /* descend into subtypes until expression matches type */
2256 orig_type = path->top_type;
2257 type = skip_typeref(orig_type);
2259 sub = initializer_from_expression(orig_type, expression);
2263 if(!is_type_valid(type)) {
2266 if(is_type_scalar(type)) {
2267 errorf(&expression->base.source_position,
2268 "expression '%E' doesn't match expected type '%T'",
2269 expression, orig_type);
2273 descend_into_subtype(path);
2277 /* update largest index of top array */
2278 const type_path_entry_t *first = &path->path[0];
2279 type_t *first_type = first->type;
2280 first_type = skip_typeref(first_type);
2281 if(is_type_array(first_type)) {
2282 size_t index = first->v.index;
2283 if(index > path->max_index)
2284 path->max_index = index;
2288 /* append to initializers list */
2289 ARR_APP1(initializer_t*, initializers, sub);
2292 if(env->declaration != NULL)
2293 warningf(HERE, "excess elements in struct initializer for '%Y'",
2294 env->declaration->symbol);
2296 warningf(HERE, "excess elements in struct initializer");
2300 if(token.type == '}') {
2304 if(token.type == '}') {
2309 /* advance to the next declaration if we are not at the end */
2310 advance_current_object(path, top_path_level);
2311 orig_type = path->top_type;
2312 if(orig_type != NULL)
2313 type = skip_typeref(orig_type);
2319 size_t len = ARR_LEN(initializers);
2320 size_t size = sizeof(initializer_list_t) + len * sizeof(initializers[0]);
2321 initializer_t *result = allocate_ast_zero(size);
2322 result->kind = INITIALIZER_LIST;
2323 result->list.len = len;
2324 memcpy(&result->list.initializers, initializers,
2325 len * sizeof(initializers[0]));
2327 DEL_ARR_F(initializers);
2328 ascend_to(path, top_path_level);
2333 skip_initializers();
2334 DEL_ARR_F(initializers);
2335 ascend_to(path, top_path_level);
2340 * Parses an initializer. Parsers either a compound literal
2341 * (env->declaration == NULL) or an initializer of a declaration.
2343 static initializer_t *parse_initializer(parse_initializer_env_t *env)
2345 type_t *type = skip_typeref(env->type);
2346 initializer_t *result = NULL;
2349 if(is_type_scalar(type)) {
2350 result = parse_scalar_initializer(type, env->must_be_constant);
2351 } else if(token.type == '{') {
2355 memset(&path, 0, sizeof(path));
2356 path.top_type = env->type;
2357 path.path = NEW_ARR_F(type_path_entry_t, 0);
2359 descend_into_subtype(&path);
2361 add_anchor_token('}');
2362 result = parse_sub_initializer(&path, env->type, 1, env);
2363 rem_anchor_token('}');
2365 max_index = path.max_index;
2366 DEL_ARR_F(path.path);
2370 /* parse_scalar_initializer() also works in this case: we simply
2371 * have an expression without {} around it */
2372 result = parse_scalar_initializer(type, env->must_be_constant);
2375 /* § 6.7.5 (22) array initializers for arrays with unknown size determine
2376 * the array type size */
2377 if(is_type_array(type) && type->array.size_expression == NULL
2378 && result != NULL) {
2380 switch (result->kind) {
2381 case INITIALIZER_LIST:
2382 size = max_index + 1;
2385 case INITIALIZER_STRING:
2386 size = result->string.string.size;
2389 case INITIALIZER_WIDE_STRING:
2390 size = result->wide_string.string.size;
2394 internal_errorf(HERE, "invalid initializer type");
2397 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
2398 cnst->base.type = type_size_t;
2399 cnst->conste.v.int_value = size;
2401 type_t *new_type = duplicate_type(type);
2403 new_type->array.size_expression = cnst;
2404 new_type->array.size_constant = true;
2405 new_type->array.size = size;
2406 env->type = new_type;
2414 static declaration_t *append_declaration(declaration_t *declaration);
2416 static declaration_t *parse_compound_type_specifier(bool is_struct)
2418 gnu_attribute_t *attributes = NULL;
2425 symbol_t *symbol = NULL;
2426 declaration_t *declaration = NULL;
2428 if (token.type == T___attribute__) {
2429 parse_attributes(&attributes);
2432 if(token.type == T_IDENTIFIER) {
2433 symbol = token.v.symbol;
2437 declaration = get_declaration(symbol, NAMESPACE_STRUCT);
2439 declaration = get_declaration(symbol, NAMESPACE_UNION);
2441 } else if(token.type != '{') {
2443 parse_error_expected("while parsing struct type specifier",
2444 T_IDENTIFIER, '{', NULL);
2446 parse_error_expected("while parsing union type specifier",
2447 T_IDENTIFIER, '{', NULL);
2453 if(declaration == NULL) {
2454 declaration = allocate_declaration_zero();
2455 declaration->namespc =
2456 (is_struct ? NAMESPACE_STRUCT : NAMESPACE_UNION);
2457 declaration->source_position = token.source_position;
2458 declaration->symbol = symbol;
2459 declaration->parent_scope = scope;
2460 if (symbol != NULL) {
2461 environment_push(declaration);
2463 append_declaration(declaration);
2466 if(token.type == '{') {
2467 if (declaration->init.complete) {
2468 assert(symbol != NULL);
2469 errorf(HERE, "multiple definitions of '%s %Y'",
2470 is_struct ? "struct" : "union", symbol);
2471 declaration->scope.declarations = NULL;
2473 declaration->init.complete = true;
2475 parse_compound_type_entries(declaration);
2476 parse_attributes(&attributes);
2482 static void parse_enum_entries(type_t *const enum_type)
2486 if(token.type == '}') {
2488 errorf(HERE, "empty enum not allowed");
2492 add_anchor_token('}');
2494 if(token.type != T_IDENTIFIER) {
2495 parse_error_expected("while parsing enum entry", T_IDENTIFIER, NULL);
2497 rem_anchor_token('}');
2501 declaration_t *const entry = allocate_declaration_zero();
2502 entry->storage_class = STORAGE_CLASS_ENUM_ENTRY;
2503 entry->type = enum_type;
2504 entry->symbol = token.v.symbol;
2505 entry->source_position = token.source_position;
2508 if(token.type == '=') {
2510 expression_t *value = parse_constant_expression();
2512 value = create_implicit_cast(value, enum_type);
2513 entry->init.enum_value = value;
2518 record_declaration(entry);
2520 if(token.type != ',')
2523 } while(token.type != '}');
2524 rem_anchor_token('}');
2532 static type_t *parse_enum_specifier(void)
2534 gnu_attribute_t *attributes = NULL;
2535 declaration_t *declaration;
2539 if(token.type == T_IDENTIFIER) {
2540 symbol = token.v.symbol;
2543 declaration = get_declaration(symbol, NAMESPACE_ENUM);
2544 } else if(token.type != '{') {
2545 parse_error_expected("while parsing enum type specifier",
2546 T_IDENTIFIER, '{', NULL);
2553 if(declaration == NULL) {
2554 declaration = allocate_declaration_zero();
2555 declaration->namespc = NAMESPACE_ENUM;
2556 declaration->source_position = token.source_position;
2557 declaration->symbol = symbol;
2558 declaration->parent_scope = scope;
2561 type_t *const type = allocate_type_zero(TYPE_ENUM, &declaration->source_position);
2562 type->enumt.declaration = declaration;
2564 if(token.type == '{') {
2565 if(declaration->init.complete) {
2566 errorf(HERE, "multiple definitions of enum %Y", symbol);
2568 if (symbol != NULL) {
2569 environment_push(declaration);
2571 append_declaration(declaration);
2572 declaration->init.complete = true;
2574 parse_enum_entries(type);
2575 parse_attributes(&attributes);
2582 * if a symbol is a typedef to another type, return true
2584 static bool is_typedef_symbol(symbol_t *symbol)
2586 const declaration_t *const declaration =
2587 get_declaration(symbol, NAMESPACE_NORMAL);
2589 declaration != NULL &&
2590 declaration->storage_class == STORAGE_CLASS_TYPEDEF;
2593 static type_t *parse_typeof(void)
2600 add_anchor_token(')');
2602 expression_t *expression = NULL;
2605 switch(token.type) {
2606 case T___extension__:
2607 /* this can be a prefix to a typename or an expression */
2608 /* we simply eat it now. */
2611 } while(token.type == T___extension__);
2615 if(is_typedef_symbol(token.v.symbol)) {
2616 type = parse_typename();
2618 expression = parse_expression();
2619 type = expression->base.type;
2624 type = parse_typename();
2628 expression = parse_expression();
2629 type = expression->base.type;
2633 rem_anchor_token(')');
2636 type_t *typeof_type = allocate_type_zero(TYPE_TYPEOF, &expression->base.source_position);
2637 typeof_type->typeoft.expression = expression;
2638 typeof_type->typeoft.typeof_type = type;
2646 SPECIFIER_SIGNED = 1 << 0,
2647 SPECIFIER_UNSIGNED = 1 << 1,
2648 SPECIFIER_LONG = 1 << 2,
2649 SPECIFIER_INT = 1 << 3,
2650 SPECIFIER_DOUBLE = 1 << 4,
2651 SPECIFIER_CHAR = 1 << 5,
2652 SPECIFIER_SHORT = 1 << 6,
2653 SPECIFIER_LONG_LONG = 1 << 7,
2654 SPECIFIER_FLOAT = 1 << 8,
2655 SPECIFIER_BOOL = 1 << 9,
2656 SPECIFIER_VOID = 1 << 10,
2657 SPECIFIER_INT8 = 1 << 11,
2658 SPECIFIER_INT16 = 1 << 12,
2659 SPECIFIER_INT32 = 1 << 13,
2660 SPECIFIER_INT64 = 1 << 14,
2661 SPECIFIER_INT128 = 1 << 15,
2662 SPECIFIER_COMPLEX = 1 << 16,
2663 SPECIFIER_IMAGINARY = 1 << 17,
2666 static type_t *create_builtin_type(symbol_t *const symbol,
2667 type_t *const real_type)
2669 type_t *type = allocate_type_zero(TYPE_BUILTIN, &builtin_source_position);
2670 type->builtin.symbol = symbol;
2671 type->builtin.real_type = real_type;
2673 type_t *result = typehash_insert(type);
2674 if(type != result) {
2681 static type_t *get_typedef_type(symbol_t *symbol)
2683 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
2684 if(declaration == NULL ||
2685 declaration->storage_class != STORAGE_CLASS_TYPEDEF)
2688 type_t *type = allocate_type_zero(TYPE_TYPEDEF, &declaration->source_position);
2689 type->typedeft.declaration = declaration;
2695 * check for the allowed MS alignment values.
2697 static bool check_elignment_value(long long intvalue) {
2698 if(intvalue < 1 || intvalue > 8192) {
2699 errorf(HERE, "illegal alignment value");
2702 unsigned v = (unsigned)intvalue;
2703 for(unsigned i = 1; i <= 8192; i += i) {
2707 errorf(HERE, "alignment must be power of two");
2711 #define DET_MOD(name, tag) do { \
2712 if(*modifiers & tag) warningf(HERE, #name " used more than once"); \
2713 *modifiers |= tag; \
2716 static void parse_microsoft_extended_decl_modifier(declaration_specifiers_t *specifiers)
2718 decl_modifiers_t *modifiers = &specifiers->decl_modifiers;
2721 if(token.type == T_restrict) {
2723 DET_MOD(restrict, DM_RESTRICT);
2725 } else if(token.type != T_IDENTIFIER)
2727 symbol_t *symbol = token.v.symbol;
2728 if(symbol == sym_align) {
2731 if(token.type != T_INTEGER)
2733 if(check_elignment_value(token.v.intvalue)) {
2734 if(specifiers->alignment != 0)
2735 warningf(HERE, "align used more than once");
2736 specifiers->alignment = (unsigned char)token.v.intvalue;
2740 } else if(symbol == sym_allocate) {
2743 if(token.type != T_IDENTIFIER)
2745 (void)token.v.symbol;
2747 } else if(symbol == sym_dllimport) {
2749 DET_MOD(dllimport, DM_DLLIMPORT);
2750 } else if(symbol == sym_dllexport) {
2752 DET_MOD(dllexport, DM_DLLEXPORT);
2753 } else if(symbol == sym_thread) {
2755 DET_MOD(thread, DM_THREAD);
2756 } else if(symbol == sym_naked) {
2758 DET_MOD(naked, DM_NAKED);
2759 } else if(symbol == sym_noinline) {
2761 DET_MOD(noinline, DM_NOINLINE);
2762 } else if(symbol == sym_noreturn) {
2764 DET_MOD(noreturn, DM_NORETURN);
2765 } else if(symbol == sym_nothrow) {
2767 DET_MOD(nothrow, DM_NOTHROW);
2768 } else if(symbol == sym_novtable) {
2770 DET_MOD(novtable, DM_NOVTABLE);
2771 } else if(symbol == sym_property) {
2775 bool is_get = false;
2776 if(token.type != T_IDENTIFIER)
2778 if(token.v.symbol == sym_get) {
2780 } else if(token.v.symbol == sym_put) {
2782 errorf(HERE, "Bad property name '%Y'", token.v.symbol);
2787 if(token.type != T_IDENTIFIER)
2790 if(specifiers->get_property_sym != NULL) {
2791 errorf(HERE, "get property name already specified");
2793 specifiers->get_property_sym = token.v.symbol;
2796 if(specifiers->put_property_sym != NULL) {
2797 errorf(HERE, "put property name already specified");
2799 specifiers->put_property_sym = token.v.symbol;
2803 if(token.type == ',') {
2810 } else if(symbol == sym_selectany) {
2812 DET_MOD(selectany, DM_SELECTANY);
2813 } else if(symbol == sym_uuid) {
2816 if(token.type != T_STRING_LITERAL)
2820 } else if(symbol == sym_deprecated) {
2822 if(specifiers->deprecated != 0)
2823 warningf(HERE, "deprecated used more than once");
2824 specifiers->deprecated = 1;
2825 if(token.type == '(') {
2827 if(token.type == T_STRING_LITERAL) {
2828 specifiers->deprecated_string = token.v.string.begin;
2831 errorf(HERE, "string literal expected");
2835 } else if(symbol == sym_noalias) {
2837 DET_MOD(noalias, DM_NOALIAS);
2839 warningf(HERE, "Unknown modifier %Y ignored", token.v.symbol);
2841 if(token.type == '(')
2845 if (token.type == ',')
2852 static void parse_declaration_specifiers(declaration_specifiers_t *specifiers)
2854 type_t *type = NULL;
2855 unsigned type_qualifiers = 0;
2856 unsigned type_specifiers = 0;
2859 specifiers->source_position = token.source_position;
2862 switch(token.type) {
2865 #define MATCH_STORAGE_CLASS(token, class) \
2867 if(specifiers->declared_storage_class != STORAGE_CLASS_NONE) { \
2868 errorf(HERE, "multiple storage classes in declaration specifiers"); \
2870 specifiers->declared_storage_class = class; \
2874 MATCH_STORAGE_CLASS(T_typedef, STORAGE_CLASS_TYPEDEF)
2875 MATCH_STORAGE_CLASS(T_extern, STORAGE_CLASS_EXTERN)
2876 MATCH_STORAGE_CLASS(T_static, STORAGE_CLASS_STATIC)
2877 MATCH_STORAGE_CLASS(T_auto, STORAGE_CLASS_AUTO)
2878 MATCH_STORAGE_CLASS(T_register, STORAGE_CLASS_REGISTER)
2883 add_anchor_token(')');
2884 parse_microsoft_extended_decl_modifier(specifiers);
2885 rem_anchor_token(')');
2890 switch (specifiers->declared_storage_class) {
2891 case STORAGE_CLASS_NONE:
2892 specifiers->declared_storage_class = STORAGE_CLASS_THREAD;
2895 case STORAGE_CLASS_EXTERN:
2896 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_EXTERN;
2899 case STORAGE_CLASS_STATIC:
2900 specifiers->declared_storage_class = STORAGE_CLASS_THREAD_STATIC;
2904 errorf(HERE, "multiple storage classes in declaration specifiers");
2910 /* type qualifiers */
2911 #define MATCH_TYPE_QUALIFIER(token, qualifier) \
2913 type_qualifiers |= qualifier; \
2917 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
2918 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
2919 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
2920 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
2921 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
2922 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
2923 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
2924 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
2926 case T___extension__:
2931 /* type specifiers */
2932 #define MATCH_SPECIFIER(token, specifier, name) \
2935 if(type_specifiers & specifier) { \
2936 errorf(HERE, "multiple " name " type specifiers given"); \
2938 type_specifiers |= specifier; \
2942 MATCH_SPECIFIER(T_void, SPECIFIER_VOID, "void")
2943 MATCH_SPECIFIER(T_char, SPECIFIER_CHAR, "char")
2944 MATCH_SPECIFIER(T_short, SPECIFIER_SHORT, "short")
2945 MATCH_SPECIFIER(T_int, SPECIFIER_INT, "int")
2946 MATCH_SPECIFIER(T_float, SPECIFIER_FLOAT, "float")
2947 MATCH_SPECIFIER(T_double, SPECIFIER_DOUBLE, "double")
2948 MATCH_SPECIFIER(T_signed, SPECIFIER_SIGNED, "signed")
2949 MATCH_SPECIFIER(T_unsigned, SPECIFIER_UNSIGNED, "unsigned")
2950 MATCH_SPECIFIER(T__Bool, SPECIFIER_BOOL, "_Bool")
2951 MATCH_SPECIFIER(T__int8, SPECIFIER_INT8, "_int8")
2952 MATCH_SPECIFIER(T__int16, SPECIFIER_INT16, "_int16")
2953 MATCH_SPECIFIER(T__int32, SPECIFIER_INT32, "_int32")
2954 MATCH_SPECIFIER(T__int64, SPECIFIER_INT64, "_int64")
2955 MATCH_SPECIFIER(T__int128, SPECIFIER_INT128, "_int128")
2956 MATCH_SPECIFIER(T__Complex, SPECIFIER_COMPLEX, "_Complex")
2957 MATCH_SPECIFIER(T__Imaginary, SPECIFIER_IMAGINARY, "_Imaginary")
2959 case T__forceinline:
2960 /* only in microsoft mode */
2961 specifiers->decl_modifiers |= DM_FORCEINLINE;
2965 specifiers->is_inline = true;
2970 if(type_specifiers & SPECIFIER_LONG_LONG) {
2971 errorf(HERE, "multiple type specifiers given");
2972 } else if(type_specifiers & SPECIFIER_LONG) {
2973 type_specifiers |= SPECIFIER_LONG_LONG;
2975 type_specifiers |= SPECIFIER_LONG;
2980 type = allocate_type_zero(TYPE_COMPOUND_STRUCT, HERE);
2982 type->compound.declaration = parse_compound_type_specifier(true);
2986 type = allocate_type_zero(TYPE_COMPOUND_UNION, HERE);
2988 type->compound.declaration = parse_compound_type_specifier(false);
2992 type = parse_enum_specifier();
2995 type = parse_typeof();
2997 case T___builtin_va_list:
2998 type = duplicate_type(type_valist);
3002 case T___attribute__:
3003 parse_attributes(&specifiers->gnu_attributes);
3006 case T_IDENTIFIER: {
3007 /* only parse identifier if we haven't found a type yet */
3008 if(type != NULL || type_specifiers != 0)
3009 goto finish_specifiers;
3011 type_t *typedef_type = get_typedef_type(token.v.symbol);
3013 if(typedef_type == NULL)
3014 goto finish_specifiers;
3017 type = typedef_type;
3021 /* function specifier */
3023 goto finish_specifiers;
3030 atomic_type_kind_t atomic_type;
3032 /* match valid basic types */
3033 switch(type_specifiers) {
3034 case SPECIFIER_VOID:
3035 atomic_type = ATOMIC_TYPE_VOID;
3037 case SPECIFIER_CHAR:
3038 atomic_type = ATOMIC_TYPE_CHAR;
3040 case SPECIFIER_SIGNED | SPECIFIER_CHAR:
3041 atomic_type = ATOMIC_TYPE_SCHAR;
3043 case SPECIFIER_UNSIGNED | SPECIFIER_CHAR:
3044 atomic_type = ATOMIC_TYPE_UCHAR;
3046 case SPECIFIER_SHORT:
3047 case SPECIFIER_SIGNED | SPECIFIER_SHORT:
3048 case SPECIFIER_SHORT | SPECIFIER_INT:
3049 case SPECIFIER_SIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3050 atomic_type = ATOMIC_TYPE_SHORT;
3052 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT:
3053 case SPECIFIER_UNSIGNED | SPECIFIER_SHORT | SPECIFIER_INT:
3054 atomic_type = ATOMIC_TYPE_USHORT;
3057 case SPECIFIER_SIGNED:
3058 case SPECIFIER_SIGNED | SPECIFIER_INT:
3059 atomic_type = ATOMIC_TYPE_INT;
3061 case SPECIFIER_UNSIGNED:
3062 case SPECIFIER_UNSIGNED | SPECIFIER_INT:
3063 atomic_type = ATOMIC_TYPE_UINT;
3065 case SPECIFIER_LONG:
3066 case SPECIFIER_SIGNED | SPECIFIER_LONG:
3067 case SPECIFIER_LONG | SPECIFIER_INT:
3068 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3069 atomic_type = ATOMIC_TYPE_LONG;
3071 case SPECIFIER_UNSIGNED | SPECIFIER_LONG:
3072 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_INT:
3073 atomic_type = ATOMIC_TYPE_ULONG;
3075 case SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3076 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3077 case SPECIFIER_LONG | SPECIFIER_LONG_LONG | SPECIFIER_INT:
3078 case SPECIFIER_SIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3080 atomic_type = ATOMIC_TYPE_LONGLONG;
3082 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG:
3083 case SPECIFIER_UNSIGNED | SPECIFIER_LONG | SPECIFIER_LONG_LONG
3085 atomic_type = ATOMIC_TYPE_ULONGLONG;
3088 case SPECIFIER_UNSIGNED | SPECIFIER_INT8:
3089 atomic_type = unsigned_int8_type_kind;
3092 case SPECIFIER_UNSIGNED | SPECIFIER_INT16:
3093 atomic_type = unsigned_int16_type_kind;
3096 case SPECIFIER_UNSIGNED | SPECIFIER_INT32:
3097 atomic_type = unsigned_int32_type_kind;
3100 case SPECIFIER_UNSIGNED | SPECIFIER_INT64:
3101 atomic_type = unsigned_int64_type_kind;
3104 case SPECIFIER_UNSIGNED | SPECIFIER_INT128:
3105 atomic_type = unsigned_int128_type_kind;
3108 case SPECIFIER_INT8:
3109 case SPECIFIER_SIGNED | SPECIFIER_INT8:
3110 atomic_type = int8_type_kind;
3113 case SPECIFIER_INT16:
3114 case SPECIFIER_SIGNED | SPECIFIER_INT16:
3115 atomic_type = int16_type_kind;
3118 case SPECIFIER_INT32:
3119 case SPECIFIER_SIGNED | SPECIFIER_INT32:
3120 atomic_type = int32_type_kind;
3123 case SPECIFIER_INT64:
3124 case SPECIFIER_SIGNED | SPECIFIER_INT64:
3125 atomic_type = int64_type_kind;
3128 case SPECIFIER_INT128:
3129 case SPECIFIER_SIGNED | SPECIFIER_INT128:
3130 atomic_type = int128_type_kind;
3133 case SPECIFIER_FLOAT:
3134 atomic_type = ATOMIC_TYPE_FLOAT;
3136 case SPECIFIER_DOUBLE:
3137 atomic_type = ATOMIC_TYPE_DOUBLE;
3139 case SPECIFIER_LONG | SPECIFIER_DOUBLE:
3140 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3142 case SPECIFIER_BOOL:
3143 atomic_type = ATOMIC_TYPE_BOOL;
3145 case SPECIFIER_FLOAT | SPECIFIER_COMPLEX:
3146 case SPECIFIER_FLOAT | SPECIFIER_IMAGINARY:
3147 atomic_type = ATOMIC_TYPE_FLOAT;
3149 case SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3150 case SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3151 atomic_type = ATOMIC_TYPE_DOUBLE;
3153 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_COMPLEX:
3154 case SPECIFIER_LONG | SPECIFIER_DOUBLE | SPECIFIER_IMAGINARY:
3155 atomic_type = ATOMIC_TYPE_LONG_DOUBLE;
3158 /* invalid specifier combination, give an error message */
3159 if(type_specifiers == 0) {
3160 if (! strict_mode) {
3161 if (warning.implicit_int) {
3162 warningf(HERE, "no type specifiers in declaration, using 'int'");
3164 atomic_type = ATOMIC_TYPE_INT;
3167 errorf(HERE, "no type specifiers given in declaration");
3169 } else if((type_specifiers & SPECIFIER_SIGNED) &&
3170 (type_specifiers & SPECIFIER_UNSIGNED)) {
3171 errorf(HERE, "signed and unsigned specifiers gives");
3172 } else if(type_specifiers & (SPECIFIER_SIGNED | SPECIFIER_UNSIGNED)) {
3173 errorf(HERE, "only integer types can be signed or unsigned");
3175 errorf(HERE, "multiple datatypes in declaration");
3177 atomic_type = ATOMIC_TYPE_INVALID;
3180 if(type_specifiers & SPECIFIER_COMPLEX &&
3181 atomic_type != ATOMIC_TYPE_INVALID) {
3182 type = allocate_type_zero(TYPE_COMPLEX, &builtin_source_position);
3183 type->complex.akind = atomic_type;
3184 } else if(type_specifiers & SPECIFIER_IMAGINARY &&
3185 atomic_type != ATOMIC_TYPE_INVALID) {
3186 type = allocate_type_zero(TYPE_IMAGINARY, &builtin_source_position);
3187 type->imaginary.akind = atomic_type;
3189 type = allocate_type_zero(TYPE_ATOMIC, &builtin_source_position);
3190 type->atomic.akind = atomic_type;
3194 if(type_specifiers != 0) {
3195 errorf(HERE, "multiple datatypes in declaration");
3199 type->base.qualifiers = type_qualifiers;
3200 /* FIXME: check type qualifiers here */
3202 type_t *result = typehash_insert(type);
3203 if(newtype && result != type) {
3207 specifiers->type = result;
3212 static type_qualifiers_t parse_type_qualifiers(void)
3214 type_qualifiers_t type_qualifiers = TYPE_QUALIFIER_NONE;
3217 switch(token.type) {
3218 /* type qualifiers */
3219 MATCH_TYPE_QUALIFIER(T_const, TYPE_QUALIFIER_CONST);
3220 MATCH_TYPE_QUALIFIER(T_restrict, TYPE_QUALIFIER_RESTRICT);
3221 MATCH_TYPE_QUALIFIER(T_volatile, TYPE_QUALIFIER_VOLATILE);
3222 /* microsoft extended type modifiers */
3223 MATCH_TYPE_QUALIFIER(T__w64, TYPE_QUALIFIER_W64);
3224 MATCH_TYPE_QUALIFIER(T___ptr32, TYPE_QUALIFIER_PTR32);
3225 MATCH_TYPE_QUALIFIER(T___ptr64, TYPE_QUALIFIER_PTR64);
3226 MATCH_TYPE_QUALIFIER(T___uptr, TYPE_QUALIFIER_UPTR);
3227 MATCH_TYPE_QUALIFIER(T___sptr, TYPE_QUALIFIER_SPTR);
3230 return type_qualifiers;
3235 static declaration_t *parse_identifier_list(void)
3237 declaration_t *declarations = NULL;
3238 declaration_t *last_declaration = NULL;
3240 declaration_t *const declaration = allocate_declaration_zero();
3241 declaration->type = NULL; /* a K&R parameter list has no types, yet */
3242 declaration->source_position = token.source_position;
3243 declaration->symbol = token.v.symbol;
3246 if(last_declaration != NULL) {
3247 last_declaration->next = declaration;
3249 declarations = declaration;
3251 last_declaration = declaration;
3253 if (token.type != ',') {
3257 } while(token.type == T_IDENTIFIER);
3259 return declarations;
3262 static void semantic_parameter(declaration_t *declaration)
3264 /* TODO: improve error messages */
3266 if(declaration->declared_storage_class == STORAGE_CLASS_TYPEDEF) {
3267 errorf(HERE, "typedef not allowed in parameter list");
3268 } else if(declaration->declared_storage_class != STORAGE_CLASS_NONE
3269 && declaration->declared_storage_class != STORAGE_CLASS_REGISTER) {
3270 errorf(HERE, "parameter may only have none or register storage class");
3273 type_t *const orig_type = declaration->type;
3274 type_t * type = skip_typeref(orig_type);
3276 /* Array as last part of a parameter type is just syntactic sugar. Turn it
3277 * into a pointer. § 6.7.5.3 (7) */
3278 if (is_type_array(type)) {
3279 type_t *const element_type = type->array.element_type;
3281 type = make_pointer_type(element_type, type->base.qualifiers);
3283 declaration->type = type;
3286 if(is_type_incomplete(type)) {
3287 errorf(HERE, "incomplete type '%T' not allowed for parameter '%Y'",
3288 orig_type, declaration->symbol);
3292 static declaration_t *parse_parameter(void)
3294 declaration_specifiers_t specifiers;
3295 memset(&specifiers, 0, sizeof(specifiers));
3297 parse_declaration_specifiers(&specifiers);
3299 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/true);
3301 semantic_parameter(declaration);
3306 static declaration_t *parse_parameters(function_type_t *type)
3308 declaration_t *declarations = NULL;
3311 add_anchor_token(')');
3312 int saved_comma_state = save_and_reset_anchor_state(',');
3314 if(token.type == T_IDENTIFIER) {
3315 symbol_t *symbol = token.v.symbol;
3316 if(!is_typedef_symbol(symbol)) {
3317 type->kr_style_parameters = true;
3318 declarations = parse_identifier_list();
3319 goto parameters_finished;
3323 if(token.type == ')') {
3324 type->unspecified_parameters = 1;
3325 goto parameters_finished;
3327 if(token.type == T_void && look_ahead(1)->type == ')') {
3329 goto parameters_finished;
3332 declaration_t *declaration;
3333 declaration_t *last_declaration = NULL;
3334 function_parameter_t *parameter;
3335 function_parameter_t *last_parameter = NULL;
3338 switch(token.type) {
3342 goto parameters_finished;
3345 case T___extension__:
3347 declaration = parse_parameter();
3349 parameter = obstack_alloc(type_obst, sizeof(parameter[0]));
3350 memset(parameter, 0, sizeof(parameter[0]));
3351 parameter->type = declaration->type;
3353 if(last_parameter != NULL) {
3354 last_declaration->next = declaration;
3355 last_parameter->next = parameter;
3357 type->parameters = parameter;
3358 declarations = declaration;
3360 last_parameter = parameter;
3361 last_declaration = declaration;
3365 goto parameters_finished;
3367 if (token.type != ',') {
3368 goto parameters_finished;
3374 parameters_finished:
3375 rem_anchor_token(')');
3378 restore_anchor_state(',', saved_comma_state);
3379 return declarations;
3382 restore_anchor_state(',', saved_comma_state);
3391 } construct_type_kind_t;
3393 typedef struct construct_type_t construct_type_t;
3394 struct construct_type_t {
3395 construct_type_kind_t kind;
3396 construct_type_t *next;
3399 typedef struct parsed_pointer_t parsed_pointer_t;
3400 struct parsed_pointer_t {
3401 construct_type_t construct_type;
3402 type_qualifiers_t type_qualifiers;
3405 typedef struct construct_function_type_t construct_function_type_t;
3406 struct construct_function_type_t {
3407 construct_type_t construct_type;
3408 type_t *function_type;
3411 typedef struct parsed_array_t parsed_array_t;
3412 struct parsed_array_t {
3413 construct_type_t construct_type;
3414 type_qualifiers_t type_qualifiers;
3420 typedef struct construct_base_type_t construct_base_type_t;
3421 struct construct_base_type_t {
3422 construct_type_t construct_type;
3426 static construct_type_t *parse_pointer_declarator(void)
3430 parsed_pointer_t *pointer = obstack_alloc(&temp_obst, sizeof(pointer[0]));
3431 memset(pointer, 0, sizeof(pointer[0]));
3432 pointer->construct_type.kind = CONSTRUCT_POINTER;
3433 pointer->type_qualifiers = parse_type_qualifiers();
3435 return (construct_type_t*) pointer;
3438 static construct_type_t *parse_array_declarator(void)
3441 add_anchor_token(']');
3443 parsed_array_t *array = obstack_alloc(&temp_obst, sizeof(array[0]));
3444 memset(array, 0, sizeof(array[0]));
3445 array->construct_type.kind = CONSTRUCT_ARRAY;
3447 if(token.type == T_static) {
3448 array->is_static = true;
3452 type_qualifiers_t type_qualifiers = parse_type_qualifiers();
3453 if(type_qualifiers != 0) {
3454 if(token.type == T_static) {
3455 array->is_static = true;
3459 array->type_qualifiers = type_qualifiers;
3461 if(token.type == '*' && look_ahead(1)->type == ']') {
3462 array->is_variable = true;
3464 } else if(token.type != ']') {
3465 array->size = parse_assignment_expression();
3468 rem_anchor_token(']');
3471 return (construct_type_t*) array;
3476 static construct_type_t *parse_function_declarator(declaration_t *declaration)
3479 if(declaration != NULL) {
3480 type = allocate_type_zero(TYPE_FUNCTION, &declaration->source_position);
3482 type = allocate_type_zero(TYPE_FUNCTION, HERE);
3485 declaration_t *parameters = parse_parameters(&type->function);
3486 if(declaration != NULL) {
3487 declaration->scope.declarations = parameters;
3490 construct_function_type_t *construct_function_type =
3491 obstack_alloc(&temp_obst, sizeof(construct_function_type[0]));
3492 memset(construct_function_type, 0, sizeof(construct_function_type[0]));
3493 construct_function_type->construct_type.kind = CONSTRUCT_FUNCTION;
3494 construct_function_type->function_type = type;
3496 return (construct_type_t*) construct_function_type;
3499 static construct_type_t *parse_inner_declarator(declaration_t *declaration,
3500 bool may_be_abstract)
3502 /* construct a single linked list of construct_type_t's which describe
3503 * how to construct the final declarator type */
3504 construct_type_t *first = NULL;
3505 construct_type_t *last = NULL;
3506 gnu_attribute_t *attributes = NULL;
3509 while(token.type == '*') {
3510 construct_type_t *type = parse_pointer_declarator();
3521 /* TODO: find out if this is correct */
3522 parse_attributes(&attributes);
3524 construct_type_t *inner_types = NULL;
3526 switch(token.type) {
3528 if(declaration == NULL) {
3529 errorf(HERE, "no identifier expected in typename");
3531 declaration->symbol = token.v.symbol;
3532 declaration->source_position = token.source_position;
3538 add_anchor_token(')');
3539 inner_types = parse_inner_declarator(declaration, may_be_abstract);
3540 rem_anchor_token(')');
3546 parse_error_expected("while parsing declarator", T_IDENTIFIER, '(', NULL);
3547 /* avoid a loop in the outermost scope, because eat_statement doesn't
3549 if(token.type == '}' && current_function == NULL) {
3557 construct_type_t *p = last;
3560 construct_type_t *type;
3561 switch(token.type) {
3563 type = parse_function_declarator(declaration);
3566 type = parse_array_declarator();
3569 goto declarator_finished;
3572 /* insert in the middle of the list (behind p) */
3574 type->next = p->next;
3585 declarator_finished:
3586 parse_attributes(&attributes);
3588 /* append inner_types at the end of the list, we don't to set last anymore
3589 * as it's not needed anymore */
3591 assert(first == NULL);
3592 first = inner_types;
3594 last->next = inner_types;
3602 static type_t *construct_declarator_type(construct_type_t *construct_list,
3605 construct_type_t *iter = construct_list;
3606 for( ; iter != NULL; iter = iter->next) {
3607 switch(iter->kind) {
3608 case CONSTRUCT_INVALID:
3609 internal_errorf(HERE, "invalid type construction found");
3610 case CONSTRUCT_FUNCTION: {
3611 construct_function_type_t *construct_function_type
3612 = (construct_function_type_t*) iter;
3614 type_t *function_type = construct_function_type->function_type;
3616 function_type->function.return_type = type;
3618 type_t *skipped_return_type = skip_typeref(type);
3619 if (is_type_function(skipped_return_type)) {
3620 errorf(HERE, "function returning function is not allowed");
3621 type = type_error_type;
3622 } else if (is_type_array(skipped_return_type)) {
3623 errorf(HERE, "function returning array is not allowed");
3624 type = type_error_type;
3626 type = function_type;
3631 case CONSTRUCT_POINTER: {
3632 parsed_pointer_t *parsed_pointer = (parsed_pointer_t*) iter;
3633 type_t *pointer_type = allocate_type_zero(TYPE_POINTER, &null_position);
3634 pointer_type->pointer.points_to = type;
3635 pointer_type->base.qualifiers = parsed_pointer->type_qualifiers;
3637 type = pointer_type;
3641 case CONSTRUCT_ARRAY: {
3642 parsed_array_t *parsed_array = (parsed_array_t*) iter;
3643 type_t *array_type = allocate_type_zero(TYPE_ARRAY, &null_position);
3645 expression_t *size_expression = parsed_array->size;
3646 if(size_expression != NULL) {
3648 = create_implicit_cast(size_expression, type_size_t);
3651 array_type->base.qualifiers = parsed_array->type_qualifiers;
3652 array_type->array.element_type = type;
3653 array_type->array.is_static = parsed_array->is_static;
3654 array_type->array.is_variable = parsed_array->is_variable;
3655 array_type->array.size_expression = size_expression;
3657 if(size_expression != NULL) {
3658 if(is_constant_expression(size_expression)) {
3659 array_type->array.size_constant = true;
3660 array_type->array.size
3661 = fold_constant(size_expression);
3663 array_type->array.is_vla = true;
3667 type_t *skipped_type = skip_typeref(type);
3668 if (is_type_atomic(skipped_type, ATOMIC_TYPE_VOID)) {
3669 errorf(HERE, "array of void is not allowed");
3670 type = type_error_type;
3678 type_t *hashed_type = typehash_insert(type);
3679 if(hashed_type != type) {
3680 /* the function type was constructed earlier freeing it here will
3681 * destroy other types... */
3682 if(iter->kind != CONSTRUCT_FUNCTION) {
3692 static declaration_t *parse_declarator(
3693 const declaration_specifiers_t *specifiers, bool may_be_abstract)
3695 declaration_t *const declaration = allocate_declaration_zero();
3696 declaration->declared_storage_class = specifiers->declared_storage_class;
3697 declaration->decl_modifiers = specifiers->decl_modifiers;
3698 declaration->deprecated = specifiers->deprecated;
3699 declaration->deprecated_string = specifiers->deprecated_string;
3700 declaration->get_property_sym = specifiers->get_property_sym;
3701 declaration->put_property_sym = specifiers->put_property_sym;
3702 declaration->is_inline = specifiers->is_inline;
3704 declaration->storage_class = specifiers->declared_storage_class;
3705 if(declaration->storage_class == STORAGE_CLASS_NONE
3706 && scope != global_scope) {
3707 declaration->storage_class = STORAGE_CLASS_AUTO;
3710 if(specifiers->alignment != 0) {
3711 /* TODO: add checks here */
3712 declaration->alignment = specifiers->alignment;
3715 construct_type_t *construct_type
3716 = parse_inner_declarator(declaration, may_be_abstract);
3717 type_t *const type = specifiers->type;
3718 declaration->type = construct_declarator_type(construct_type, type);
3720 if(construct_type != NULL) {
3721 obstack_free(&temp_obst, construct_type);
3727 static type_t *parse_abstract_declarator(type_t *base_type)
3729 construct_type_t *construct_type = parse_inner_declarator(NULL, 1);
3731 type_t *result = construct_declarator_type(construct_type, base_type);
3732 if(construct_type != NULL) {
3733 obstack_free(&temp_obst, construct_type);
3739 static declaration_t *append_declaration(declaration_t* const declaration)
3741 if (last_declaration != NULL) {
3742 last_declaration->next = declaration;
3744 scope->declarations = declaration;
3746 last_declaration = declaration;
3751 * Check if the declaration of main is suspicious. main should be a
3752 * function with external linkage, returning int, taking either zero
3753 * arguments, two, or three arguments of appropriate types, ie.
3755 * int main([ int argc, char **argv [, char **env ] ]).
3757 * @param decl the declaration to check
3758 * @param type the function type of the declaration
3760 static void check_type_of_main(const declaration_t *const decl, const function_type_t *const func_type)
3762 if (decl->storage_class == STORAGE_CLASS_STATIC) {
3763 warningf(&decl->source_position,
3764 "'main' is normally a non-static function");
3766 if (skip_typeref(func_type->return_type) != type_int) {
3767 warningf(&decl->source_position,
3768 "return type of 'main' should be 'int', but is '%T'",
3769 func_type->return_type);
3771 const function_parameter_t *parm = func_type->parameters;
3773 type_t *const first_type = parm->type;
3774 if (!types_compatible(skip_typeref(first_type), type_int)) {
3775 warningf(&decl->source_position,
3776 "first argument of 'main' should be 'int', but is '%T'", first_type);
3780 type_t *const second_type = parm->type;
3781 if (!types_compatible(skip_typeref(second_type), type_char_ptr_ptr)) {
3782 warningf(&decl->source_position,
3783 "second argument of 'main' should be 'char**', but is '%T'", second_type);
3787 type_t *const third_type = parm->type;
3788 if (!types_compatible(skip_typeref(third_type), type_char_ptr_ptr)) {
3789 warningf(&decl->source_position,
3790 "third argument of 'main' should be 'char**', but is '%T'", third_type);
3794 warningf(&decl->source_position, "'main' takes only zero, two or three arguments");
3798 warningf(&decl->source_position, "'main' takes only zero, two or three arguments");
3804 * Check if a symbol is the equal to "main".
3806 static bool is_sym_main(const symbol_t *const sym)
3808 return strcmp(sym->string, "main") == 0;
3811 static declaration_t *internal_record_declaration(
3812 declaration_t *const declaration,
3813 const bool is_function_definition)
3815 const symbol_t *const symbol = declaration->symbol;
3816 const namespace_t namespc = (namespace_t)declaration->namespc;
3818 type_t *const orig_type = declaration->type;
3819 type_t *const type = skip_typeref(orig_type);
3820 if (is_type_function(type) &&
3821 type->function.unspecified_parameters &&
3822 warning.strict_prototypes) {
3823 warningf(&declaration->source_position,
3824 "function declaration '%#T' is not a prototype",
3825 orig_type, declaration->symbol);
3828 if (is_function_definition && warning.main && is_sym_main(symbol)) {
3829 check_type_of_main(declaration, &type->function);
3832 assert(declaration->symbol != NULL);
3833 declaration_t *previous_declaration = get_declaration(symbol, namespc);
3835 assert(declaration != previous_declaration);
3836 if (previous_declaration != NULL) {
3837 if (previous_declaration->parent_scope == scope) {
3838 /* can happen for K&R style declarations */
3839 if(previous_declaration->type == NULL) {
3840 previous_declaration->type = declaration->type;
3843 const type_t *prev_type = skip_typeref(previous_declaration->type);
3844 if (!types_compatible(type, prev_type)) {
3845 errorf(&declaration->source_position,
3846 "declaration '%#T' is incompatible with '%#T' (declared %P)",
3847 orig_type, symbol, previous_declaration->type, symbol,
3848 &previous_declaration->source_position);
3850 unsigned old_storage_class = previous_declaration->storage_class;
3851 if(old_storage_class == STORAGE_CLASS_ENUM_ENTRY) {
3852 errorf(&declaration->source_position,
3853 "redeclaration of enum entry '%Y' (declared %P)",
3854 symbol, &previous_declaration->source_position);
3855 return previous_declaration;
3858 unsigned new_storage_class = declaration->storage_class;
3860 if(is_type_incomplete(prev_type)) {
3861 previous_declaration->type = type;
3865 /* pretend no storage class means extern for function
3866 * declarations (except if the previous declaration is neither
3867 * none nor extern) */
3868 if (is_type_function(type)) {
3869 switch (old_storage_class) {
3870 case STORAGE_CLASS_NONE:
3871 old_storage_class = STORAGE_CLASS_EXTERN;
3873 case STORAGE_CLASS_EXTERN:
3874 if (is_function_definition) {
3875 if (warning.missing_prototypes &&
3876 prev_type->function.unspecified_parameters &&
3877 !is_sym_main(symbol)) {
3878 warningf(&declaration->source_position,
3879 "no previous prototype for '%#T'",
3882 } else if (new_storage_class == STORAGE_CLASS_NONE) {
3883 new_storage_class = STORAGE_CLASS_EXTERN;
3891 if (old_storage_class == STORAGE_CLASS_EXTERN &&
3892 new_storage_class == STORAGE_CLASS_EXTERN) {
3893 warn_redundant_declaration:
3894 if (warning.redundant_decls) {
3895 warningf(&declaration->source_position,
3896 "redundant declaration for '%Y' (declared %P)",
3897 symbol, &previous_declaration->source_position);
3899 } else if (current_function == NULL) {
3900 if (old_storage_class != STORAGE_CLASS_STATIC &&
3901 new_storage_class == STORAGE_CLASS_STATIC) {
3902 errorf(&declaration->source_position,
3903 "static declaration of '%Y' follows non-static declaration (declared %P)",
3904 symbol, &previous_declaration->source_position);
3906 if (old_storage_class != STORAGE_CLASS_EXTERN && !is_function_definition) {
3907 goto warn_redundant_declaration;
3909 if (new_storage_class == STORAGE_CLASS_NONE) {
3910 previous_declaration->storage_class = STORAGE_CLASS_NONE;
3911 previous_declaration->declared_storage_class = STORAGE_CLASS_NONE;
3915 if (old_storage_class == new_storage_class) {
3916 errorf(&declaration->source_position,
3917 "redeclaration of '%Y' (declared %P)",
3918 symbol, &previous_declaration->source_position);
3920 errorf(&declaration->source_position,
3921 "redeclaration of '%Y' with different linkage (declared %P)",
3922 symbol, &previous_declaration->source_position);
3927 if (declaration->is_inline)
3928 previous_declaration->is_inline = true;
3929 return previous_declaration;
3931 } else if (is_function_definition) {
3932 if (declaration->storage_class != STORAGE_CLASS_STATIC) {
3933 if (warning.missing_prototypes && !is_sym_main(symbol)) {
3934 warningf(&declaration->source_position,
3935 "no previous prototype for '%#T'", orig_type, symbol);
3936 } else if (warning.missing_declarations && !is_sym_main(symbol)) {
3937 warningf(&declaration->source_position,
3938 "no previous declaration for '%#T'", orig_type,
3942 } else if (warning.missing_declarations &&
3943 scope == global_scope &&
3944 !is_type_function(type) && (
3945 declaration->storage_class == STORAGE_CLASS_NONE ||
3946 declaration->storage_class == STORAGE_CLASS_THREAD
3948 warningf(&declaration->source_position,
3949 "no previous declaration for '%#T'", orig_type, symbol);
3952 assert(declaration->parent_scope == NULL);
3953 assert(scope != NULL);
3955 declaration->parent_scope = scope;
3957 environment_push(declaration);
3958 return append_declaration(declaration);
3961 static declaration_t *record_declaration(declaration_t *declaration)
3963 return internal_record_declaration(declaration, false);
3966 static declaration_t *record_function_definition(declaration_t *declaration)
3968 return internal_record_declaration(declaration, true);
3971 static void parser_error_multiple_definition(declaration_t *declaration,
3972 const source_position_t *source_position)
3974 errorf(source_position, "multiple definition of symbol '%Y' (declared %P)",
3975 declaration->symbol, &declaration->source_position);
3978 static bool is_declaration_specifier(const token_t *token,
3979 bool only_type_specifiers)
3981 switch(token->type) {
3985 return is_typedef_symbol(token->v.symbol);
3987 case T___extension__:
3990 return !only_type_specifiers;
3997 static void parse_init_declarator_rest(declaration_t *declaration)
4001 type_t *orig_type = declaration->type;
4002 type_t *type = skip_typeref(orig_type);
4004 if(declaration->init.initializer != NULL) {
4005 parser_error_multiple_definition(declaration, HERE);
4008 bool must_be_constant = false;
4009 if(declaration->storage_class == STORAGE_CLASS_STATIC
4010 || declaration->storage_class == STORAGE_CLASS_THREAD_STATIC
4011 || declaration->parent_scope == global_scope) {
4012 must_be_constant = true;
4015 parse_initializer_env_t env;
4016 env.type = orig_type;
4017 env.must_be_constant = must_be_constant;
4018 env.declaration = declaration;
4020 initializer_t *initializer = parse_initializer(&env);
4022 if(env.type != orig_type) {
4023 orig_type = env.type;
4024 type = skip_typeref(orig_type);
4025 declaration->type = env.type;
4028 if(is_type_function(type)) {
4029 errorf(&declaration->source_position,
4030 "initializers not allowed for function types at declator '%Y' (type '%T')",
4031 declaration->symbol, orig_type);
4033 declaration->init.initializer = initializer;
4037 /* parse rest of a declaration without any declarator */
4038 static void parse_anonymous_declaration_rest(
4039 const declaration_specifiers_t *specifiers,
4040 parsed_declaration_func finished_declaration)
4044 declaration_t *const declaration = allocate_declaration_zero();
4045 declaration->type = specifiers->type;
4046 declaration->declared_storage_class = specifiers->declared_storage_class;
4047 declaration->source_position = specifiers->source_position;
4048 declaration->decl_modifiers = specifiers->decl_modifiers;
4050 if (declaration->declared_storage_class != STORAGE_CLASS_NONE) {
4051 warningf(&declaration->source_position,
4052 "useless storage class in empty declaration");
4054 declaration->storage_class = STORAGE_CLASS_NONE;
4056 type_t *type = declaration->type;
4057 switch (type->kind) {
4058 case TYPE_COMPOUND_STRUCT:
4059 case TYPE_COMPOUND_UNION: {
4060 if (type->compound.declaration->symbol == NULL) {
4061 warningf(&declaration->source_position,
4062 "unnamed struct/union that defines no instances");
4071 warningf(&declaration->source_position, "empty declaration");
4075 finished_declaration(declaration);
4078 static void parse_declaration_rest(declaration_t *ndeclaration,
4079 const declaration_specifiers_t *specifiers,
4080 parsed_declaration_func finished_declaration)
4082 add_anchor_token(';');
4083 add_anchor_token('=');
4084 add_anchor_token(',');
4086 declaration_t *declaration = finished_declaration(ndeclaration);
4088 type_t *orig_type = declaration->type;
4089 type_t *type = skip_typeref(orig_type);
4091 if (type->kind != TYPE_FUNCTION &&
4092 declaration->is_inline &&
4093 is_type_valid(type)) {
4094 warningf(&declaration->source_position,
4095 "variable '%Y' declared 'inline'\n", declaration->symbol);
4098 if(token.type == '=') {
4099 parse_init_declarator_rest(declaration);
4102 if(token.type != ',')
4106 ndeclaration = parse_declarator(specifiers, /*may_be_abstract=*/false);
4111 rem_anchor_token(';');
4112 rem_anchor_token('=');
4113 rem_anchor_token(',');
4116 static declaration_t *finished_kr_declaration(declaration_t *declaration)
4118 symbol_t *symbol = declaration->symbol;
4119 if(symbol == NULL) {
4120 errorf(HERE, "anonymous declaration not valid as function parameter");
4123 namespace_t namespc = (namespace_t) declaration->namespc;
4124 if(namespc != NAMESPACE_NORMAL) {
4125 return record_declaration(declaration);
4128 declaration_t *previous_declaration = get_declaration(symbol, namespc);
4129 if(previous_declaration == NULL ||
4130 previous_declaration->parent_scope != scope) {
4131 errorf(HERE, "expected declaration of a function parameter, found '%Y'",
4136 if(previous_declaration->type == NULL) {
4137 previous_declaration->type = declaration->type;
4138 previous_declaration->declared_storage_class = declaration->declared_storage_class;
4139 previous_declaration->storage_class = declaration->storage_class;
4140 previous_declaration->parent_scope = scope;
4141 return previous_declaration;
4143 return record_declaration(declaration);
4147 static void parse_declaration(parsed_declaration_func finished_declaration)
4149 declaration_specifiers_t specifiers;
4150 memset(&specifiers, 0, sizeof(specifiers));
4151 parse_declaration_specifiers(&specifiers);
4153 if(token.type == ';') {
4154 parse_anonymous_declaration_rest(&specifiers, append_declaration);
4156 declaration_t *declaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
4157 parse_declaration_rest(declaration, &specifiers, finished_declaration);
4161 static void parse_kr_declaration_list(declaration_t *declaration)
4163 type_t *type = skip_typeref(declaration->type);
4164 if (!is_type_function(type))
4167 if (!type->function.kr_style_parameters)
4170 /* push function parameters */
4171 int top = environment_top();
4172 scope_t *last_scope = scope;
4173 set_scope(&declaration->scope);
4175 declaration_t *parameter = declaration->scope.declarations;
4176 for ( ; parameter != NULL; parameter = parameter->next) {
4177 assert(parameter->parent_scope == NULL);
4178 parameter->parent_scope = scope;
4179 environment_push(parameter);
4182 /* parse declaration list */
4183 while (is_declaration_specifier(&token, false)) {
4184 parse_declaration(finished_kr_declaration);
4187 /* pop function parameters */
4188 assert(scope == &declaration->scope);
4189 set_scope(last_scope);
4190 environment_pop_to(top);
4192 /* update function type */
4193 type_t *new_type = duplicate_type(type);
4195 function_parameter_t *parameters = NULL;
4196 function_parameter_t *last_parameter = NULL;
4198 declaration_t *parameter_declaration = declaration->scope.declarations;
4199 for( ; parameter_declaration != NULL;
4200 parameter_declaration = parameter_declaration->next) {
4201 type_t *parameter_type = parameter_declaration->type;
4202 if(parameter_type == NULL) {
4204 errorf(HERE, "no type specified for function parameter '%Y'",
4205 parameter_declaration->symbol);
4207 if (warning.implicit_int) {
4208 warningf(HERE, "no type specified for function parameter '%Y', using 'int'",
4209 parameter_declaration->symbol);
4211 parameter_type = type_int;
4212 parameter_declaration->type = parameter_type;
4216 semantic_parameter(parameter_declaration);
4217 parameter_type = parameter_declaration->type;
4219 function_parameter_t *function_parameter
4220 = obstack_alloc(type_obst, sizeof(function_parameter[0]));
4221 memset(function_parameter, 0, sizeof(function_parameter[0]));
4223 function_parameter->type = parameter_type;
4224 if(last_parameter != NULL) {
4225 last_parameter->next = function_parameter;
4227 parameters = function_parameter;
4229 last_parameter = function_parameter;
4232 /* § 6.9.1.7: A K&R style parameter list does NOT act as a function
4234 new_type->function.parameters = parameters;
4235 new_type->function.unspecified_parameters = true;
4237 type = typehash_insert(new_type);
4238 if(type != new_type) {
4239 obstack_free(type_obst, new_type);
4242 declaration->type = type;
4245 static bool first_err = true;
4248 * When called with first_err set, prints the name of the current function,
4251 static void print_in_function(void) {
4254 diagnosticf("%s: In function '%Y':\n",
4255 current_function->source_position.input_name,
4256 current_function->symbol);
4261 * Check if all labels are defined in the current function.
4262 * Check if all labels are used in the current function.
4264 static void check_labels(void)
4266 for (const goto_statement_t *goto_statement = goto_first;
4267 goto_statement != NULL;
4268 goto_statement = goto_statement->next) {
4269 declaration_t *label = goto_statement->label;
4272 if (label->source_position.input_name == NULL) {
4273 print_in_function();
4274 errorf(&goto_statement->base.source_position,
4275 "label '%Y' used but not defined", label->symbol);
4278 goto_first = goto_last = NULL;
4280 if (warning.unused_label) {
4281 for (const label_statement_t *label_statement = label_first;
4282 label_statement != NULL;
4283 label_statement = label_statement->next) {
4284 const declaration_t *label = label_statement->label;
4286 if (! label->used) {
4287 print_in_function();
4288 warningf(&label_statement->base.source_position,
4289 "label '%Y' defined but not used", label->symbol);
4293 label_first = label_last = NULL;
4297 * Check declarations of current_function for unused entities.
4299 static void check_declarations(void)
4301 if (warning.unused_parameter) {
4302 const scope_t *scope = ¤t_function->scope;
4304 const declaration_t *parameter = scope->declarations;
4305 for (; parameter != NULL; parameter = parameter->next) {
4306 if (! parameter->used) {
4307 print_in_function();
4308 warningf(¶meter->source_position,
4309 "unused parameter '%Y'", parameter->symbol);
4313 if (warning.unused_variable) {
4317 static void parse_external_declaration(void)
4319 /* function-definitions and declarations both start with declaration
4321 declaration_specifiers_t specifiers;
4322 memset(&specifiers, 0, sizeof(specifiers));
4324 add_anchor_token(';');
4325 parse_declaration_specifiers(&specifiers);
4326 rem_anchor_token(';');
4328 /* must be a declaration */
4329 if(token.type == ';') {
4330 parse_anonymous_declaration_rest(&specifiers, append_declaration);
4334 add_anchor_token(',');
4335 add_anchor_token('=');
4336 rem_anchor_token(';');
4338 /* declarator is common to both function-definitions and declarations */
4339 declaration_t *ndeclaration = parse_declarator(&specifiers, /*may_be_abstract=*/false);
4341 rem_anchor_token(',');
4342 rem_anchor_token('=');
4343 rem_anchor_token(';');
4345 /* must be a declaration */
4346 if(token.type == ',' || token.type == '=' || token.type == ';') {
4347 parse_declaration_rest(ndeclaration, &specifiers, record_declaration);
4351 /* must be a function definition */
4352 parse_kr_declaration_list(ndeclaration);
4354 if(token.type != '{') {
4355 parse_error_expected("while parsing function definition", '{', NULL);
4356 eat_until_matching_token(';');
4360 type_t *type = ndeclaration->type;
4362 /* note that we don't skip typerefs: the standard doesn't allow them here
4363 * (so we can't use is_type_function here) */
4364 if(type->kind != TYPE_FUNCTION) {
4365 if (is_type_valid(type)) {
4366 errorf(HERE, "declarator '%#T' has a body but is not a function type",
4367 type, ndeclaration->symbol);
4373 /* § 6.7.5.3 (14) a function definition with () means no
4374 * parameters (and not unspecified parameters) */
4375 if(type->function.unspecified_parameters
4376 && type->function.parameters == NULL
4377 && !type->function.kr_style_parameters) {
4378 type_t *duplicate = duplicate_type(type);
4379 duplicate->function.unspecified_parameters = false;
4381 type = typehash_insert(duplicate);
4382 if(type != duplicate) {
4383 obstack_free(type_obst, duplicate);
4385 ndeclaration->type = type;
4388 declaration_t *const declaration = record_function_definition(ndeclaration);
4389 if(ndeclaration != declaration) {
4390 declaration->scope = ndeclaration->scope;
4392 type = skip_typeref(declaration->type);
4394 /* push function parameters and switch scope */
4395 int top = environment_top();
4396 scope_t *last_scope = scope;
4397 set_scope(&declaration->scope);
4399 declaration_t *parameter = declaration->scope.declarations;
4400 for( ; parameter != NULL; parameter = parameter->next) {
4401 if(parameter->parent_scope == &ndeclaration->scope) {
4402 parameter->parent_scope = scope;
4404 assert(parameter->parent_scope == NULL
4405 || parameter->parent_scope == scope);
4406 parameter->parent_scope = scope;
4407 environment_push(parameter);
4410 if(declaration->init.statement != NULL) {
4411 parser_error_multiple_definition(declaration, HERE);
4413 goto end_of_parse_external_declaration;
4415 /* parse function body */
4416 int label_stack_top = label_top();
4417 declaration_t *old_current_function = current_function;
4418 current_function = declaration;
4420 declaration->init.statement = parse_compound_statement(false);
4423 check_declarations();
4425 assert(current_function == declaration);
4426 current_function = old_current_function;
4427 label_pop_to(label_stack_top);
4430 end_of_parse_external_declaration:
4431 assert(scope == &declaration->scope);
4432 set_scope(last_scope);
4433 environment_pop_to(top);
4436 static type_t *make_bitfield_type(type_t *base_type, expression_t *size,
4437 source_position_t *source_position)
4439 type_t *type = allocate_type_zero(TYPE_BITFIELD, source_position);
4441 type->bitfield.base_type = base_type;
4442 type->bitfield.size = size;
4447 static declaration_t *find_compound_entry(declaration_t *compound_declaration,
4450 declaration_t *iter = compound_declaration->scope.declarations;
4451 for( ; iter != NULL; iter = iter->next) {
4452 if(iter->namespc != NAMESPACE_NORMAL)
4455 if(iter->symbol == NULL) {
4456 type_t *type = skip_typeref(iter->type);
4457 if(is_type_compound(type)) {
4458 declaration_t *result
4459 = find_compound_entry(type->compound.declaration, symbol);
4466 if(iter->symbol == symbol) {
4474 static void parse_compound_declarators(declaration_t *struct_declaration,
4475 const declaration_specifiers_t *specifiers)
4477 declaration_t *last_declaration = struct_declaration->scope.declarations;
4478 if(last_declaration != NULL) {
4479 while(last_declaration->next != NULL) {
4480 last_declaration = last_declaration->next;
4485 declaration_t *declaration;
4487 if(token.type == ':') {
4488 source_position_t source_position = *HERE;
4491 type_t *base_type = specifiers->type;
4492 expression_t *size = parse_constant_expression();
4494 if(!is_type_integer(skip_typeref(base_type))) {
4495 errorf(HERE, "bitfield base type '%T' is not an integer type",
4499 type_t *type = make_bitfield_type(base_type, size, &source_position);
4501 declaration = allocate_declaration_zero();
4502 declaration->namespc = NAMESPACE_NORMAL;
4503 declaration->declared_storage_class = STORAGE_CLASS_NONE;
4504 declaration->storage_class = STORAGE_CLASS_NONE;
4505 declaration->source_position = source_position;
4506 declaration->decl_modifiers = specifiers->decl_modifiers;
4507 declaration->type = type;
4509 declaration = parse_declarator(specifiers,/*may_be_abstract=*/true);
4511 type_t *orig_type = declaration->type;
4512 type_t *type = skip_typeref(orig_type);
4514 if(token.type == ':') {
4515 source_position_t source_position = *HERE;
4517 expression_t *size = parse_constant_expression();
4519 if(!is_type_integer(type)) {
4520 errorf(HERE, "bitfield base type '%T' is not an "
4521 "integer type", orig_type);
4524 type_t *bitfield_type = make_bitfield_type(orig_type, size, &source_position);
4525 declaration->type = bitfield_type;
4527 /* TODO we ignore arrays for now... what is missing is a check
4528 * that they're at the end of the struct */
4529 if(is_type_incomplete(type) && !is_type_array(type)) {
4531 "compound member '%Y' has incomplete type '%T'",
4532 declaration->symbol, orig_type);
4533 } else if(is_type_function(type)) {
4534 errorf(HERE, "compound member '%Y' must not have function "
4535 "type '%T'", declaration->symbol, orig_type);
4540 /* make sure we don't define a symbol multiple times */
4541 symbol_t *symbol = declaration->symbol;
4542 if(symbol != NULL) {
4543 declaration_t *prev_decl
4544 = find_compound_entry(struct_declaration, symbol);
4546 if(prev_decl != NULL) {
4547 assert(prev_decl->symbol == symbol);
4548 errorf(&declaration->source_position,
4549 "multiple declarations of symbol '%Y' (declared %P)",
4550 symbol, &prev_decl->source_position);
4554 /* append declaration */
4555 if(last_declaration != NULL) {
4556 last_declaration->next = declaration;
4558 struct_declaration->scope.declarations = declaration;
4560 last_declaration = declaration;
4562 if(token.type != ',')
4572 static void parse_compound_type_entries(declaration_t *compound_declaration)
4575 add_anchor_token('}');
4577 while(token.type != '}' && token.type != T_EOF) {
4578 declaration_specifiers_t specifiers;
4579 memset(&specifiers, 0, sizeof(specifiers));
4580 parse_declaration_specifiers(&specifiers);
4582 parse_compound_declarators(compound_declaration, &specifiers);
4584 rem_anchor_token('}');
4586 if(token.type == T_EOF) {
4587 errorf(HERE, "EOF while parsing struct");
4592 static type_t *parse_typename(void)
4594 declaration_specifiers_t specifiers;
4595 memset(&specifiers, 0, sizeof(specifiers));
4596 parse_declaration_specifiers(&specifiers);
4597 if(specifiers.declared_storage_class != STORAGE_CLASS_NONE) {
4598 /* TODO: improve error message, user does probably not know what a
4599 * storage class is...
4601 errorf(HERE, "typename may not have a storage class");
4604 type_t *result = parse_abstract_declarator(specifiers.type);
4612 typedef expression_t* (*parse_expression_function) (unsigned precedence);
4613 typedef expression_t* (*parse_expression_infix_function) (unsigned precedence,
4614 expression_t *left);
4616 typedef struct expression_parser_function_t expression_parser_function_t;
4617 struct expression_parser_function_t {
4618 unsigned precedence;
4619 parse_expression_function parser;
4620 unsigned infix_precedence;
4621 parse_expression_infix_function infix_parser;
4624 expression_parser_function_t expression_parsers[T_LAST_TOKEN];
4627 * Prints an error message if an expression was expected but not read
4629 static expression_t *expected_expression_error(void)
4631 /* skip the error message if the error token was read */
4632 if (token.type != T_ERROR) {
4633 errorf(HERE, "expected expression, got token '%K'", &token);
4637 return create_invalid_expression();
4641 * Parse a string constant.
4643 static expression_t *parse_string_const(void)
4646 if (token.type == T_STRING_LITERAL) {
4647 string_t res = token.v.string;
4649 while (token.type == T_STRING_LITERAL) {
4650 res = concat_strings(&res, &token.v.string);
4653 if (token.type != T_WIDE_STRING_LITERAL) {
4654 expression_t *const cnst = allocate_expression_zero(EXPR_STRING_LITERAL);
4655 /* note: that we use type_char_ptr here, which is already the
4656 * automatic converted type. revert_automatic_type_conversion
4657 * will construct the array type */
4658 cnst->base.type = type_char_ptr;
4659 cnst->string.value = res;
4663 wres = concat_string_wide_string(&res, &token.v.wide_string);
4665 wres = token.v.wide_string;
4670 switch (token.type) {
4671 case T_WIDE_STRING_LITERAL:
4672 wres = concat_wide_strings(&wres, &token.v.wide_string);
4675 case T_STRING_LITERAL:
4676 wres = concat_wide_string_string(&wres, &token.v.string);
4680 expression_t *const cnst = allocate_expression_zero(EXPR_WIDE_STRING_LITERAL);
4681 cnst->base.type = type_wchar_t_ptr;
4682 cnst->wide_string.value = wres;
4691 * Parse an integer constant.
4693 static expression_t *parse_int_const(void)
4695 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
4696 cnst->base.source_position = *HERE;
4697 cnst->base.type = token.datatype;
4698 cnst->conste.v.int_value = token.v.intvalue;
4706 * Parse a character constant.
4708 static expression_t *parse_character_constant(void)
4710 expression_t *cnst = allocate_expression_zero(EXPR_CHARACTER_CONSTANT);
4712 cnst->base.source_position = *HERE;
4713 cnst->base.type = token.datatype;
4714 cnst->conste.v.character = token.v.string;
4716 if (cnst->conste.v.character.size != 1) {
4717 if (warning.multichar && (c_mode & _GNUC)) {
4719 warningf(HERE, "multi-character character constant");
4721 errorf(HERE, "more than 1 characters in character constant");
4730 * Parse a wide character constant.
4732 static expression_t *parse_wide_character_constant(void)
4734 expression_t *cnst = allocate_expression_zero(EXPR_WIDE_CHARACTER_CONSTANT);
4736 cnst->base.source_position = *HERE;
4737 cnst->base.type = token.datatype;
4738 cnst->conste.v.wide_character = token.v.wide_string;
4740 if (cnst->conste.v.wide_character.size != 1) {
4741 if (warning.multichar && (c_mode & _GNUC)) {
4743 warningf(HERE, "multi-character character constant");
4745 errorf(HERE, "more than 1 characters in character constant");
4754 * Parse a float constant.
4756 static expression_t *parse_float_const(void)
4758 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
4759 cnst->base.type = token.datatype;
4760 cnst->conste.v.float_value = token.v.floatvalue;
4767 static declaration_t *create_implicit_function(symbol_t *symbol,
4768 const source_position_t *source_position)
4770 type_t *ntype = allocate_type_zero(TYPE_FUNCTION, source_position);
4771 ntype->function.return_type = type_int;
4772 ntype->function.unspecified_parameters = true;
4774 type_t *type = typehash_insert(ntype);
4779 declaration_t *const declaration = allocate_declaration_zero();
4780 declaration->storage_class = STORAGE_CLASS_EXTERN;
4781 declaration->declared_storage_class = STORAGE_CLASS_EXTERN;
4782 declaration->type = type;
4783 declaration->symbol = symbol;
4784 declaration->source_position = *source_position;
4785 declaration->parent_scope = global_scope;
4787 scope_t *old_scope = scope;
4788 set_scope(global_scope);
4790 environment_push(declaration);
4791 /* prepends the declaration to the global declarations list */
4792 declaration->next = scope->declarations;
4793 scope->declarations = declaration;
4795 assert(scope == global_scope);
4796 set_scope(old_scope);
4802 * Creates a return_type (func)(argument_type) function type if not
4805 * @param return_type the return type
4806 * @param argument_type the argument type
4808 static type_t *make_function_1_type(type_t *return_type, type_t *argument_type)
4810 function_parameter_t *parameter
4811 = obstack_alloc(type_obst, sizeof(parameter[0]));
4812 memset(parameter, 0, sizeof(parameter[0]));
4813 parameter->type = argument_type;
4815 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
4816 type->function.return_type = return_type;
4817 type->function.parameters = parameter;
4819 type_t *result = typehash_insert(type);
4820 if(result != type) {
4827 static type_t *make_function_0_type(type_t *return_type)
4829 type_t *type = allocate_type_zero(TYPE_FUNCTION, &builtin_source_position);
4830 type->function.return_type = return_type;
4831 type->function.parameters = NULL;
4833 type_t *result = typehash_insert(type);
4834 if(result != type) {
4842 * Creates a function type for some function like builtins.
4844 * @param symbol the symbol describing the builtin
4846 static type_t *get_builtin_symbol_type(symbol_t *symbol)
4848 switch(symbol->ID) {
4849 case T___builtin_alloca:
4850 return make_function_1_type(type_void_ptr, type_size_t);
4851 case T___builtin_huge_val:
4852 return make_function_0_type(type_double);
4853 case T___builtin_nan:
4854 return make_function_1_type(type_double, type_char_ptr);
4855 case T___builtin_nanf:
4856 return make_function_1_type(type_float, type_char_ptr);
4857 case T___builtin_nand:
4858 return make_function_1_type(type_long_double, type_char_ptr);
4859 case T___builtin_va_end:
4860 return make_function_1_type(type_void, type_valist);
4862 internal_errorf(HERE, "not implemented builtin symbol found");
4867 * Performs automatic type cast as described in § 6.3.2.1.
4869 * @param orig_type the original type
4871 static type_t *automatic_type_conversion(type_t *orig_type)
4873 type_t *type = skip_typeref(orig_type);
4874 if(is_type_array(type)) {
4875 array_type_t *array_type = &type->array;
4876 type_t *element_type = array_type->element_type;
4877 unsigned qualifiers = array_type->base.qualifiers;
4879 return make_pointer_type(element_type, qualifiers);
4882 if(is_type_function(type)) {
4883 return make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
4890 * reverts the automatic casts of array to pointer types and function
4891 * to function-pointer types as defined § 6.3.2.1
4893 type_t *revert_automatic_type_conversion(const expression_t *expression)
4895 switch (expression->kind) {
4896 case EXPR_REFERENCE: return expression->reference.declaration->type;
4897 case EXPR_SELECT: return expression->select.compound_entry->type;
4899 case EXPR_UNARY_DEREFERENCE: {
4900 const expression_t *const value = expression->unary.value;
4901 type_t *const type = skip_typeref(value->base.type);
4902 assert(is_type_pointer(type));
4903 return type->pointer.points_to;
4906 case EXPR_BUILTIN_SYMBOL:
4907 return get_builtin_symbol_type(expression->builtin_symbol.symbol);
4909 case EXPR_ARRAY_ACCESS: {
4910 const expression_t *array_ref = expression->array_access.array_ref;
4911 type_t *type_left = skip_typeref(array_ref->base.type);
4912 if (!is_type_valid(type_left))
4914 assert(is_type_pointer(type_left));
4915 return type_left->pointer.points_to;
4918 case EXPR_STRING_LITERAL: {
4919 size_t size = expression->string.value.size;
4920 return make_array_type(type_char, size, TYPE_QUALIFIER_NONE);
4923 case EXPR_WIDE_STRING_LITERAL: {
4924 size_t size = expression->wide_string.value.size;
4925 return make_array_type(type_wchar_t, size, TYPE_QUALIFIER_NONE);
4928 case EXPR_COMPOUND_LITERAL:
4929 return expression->compound_literal.type;
4934 return expression->base.type;
4937 static expression_t *parse_reference(void)
4939 expression_t *expression = allocate_expression_zero(EXPR_REFERENCE);
4941 reference_expression_t *ref = &expression->reference;
4942 symbol_t *const symbol = token.v.symbol;
4944 declaration_t *declaration = get_declaration(symbol, NAMESPACE_NORMAL);
4946 source_position_t source_position = token.source_position;
4949 if(declaration == NULL) {
4950 if (! strict_mode && token.type == '(') {
4951 /* an implicitly defined function */
4952 if (warning.implicit_function_declaration) {
4953 warningf(HERE, "implicit declaration of function '%Y'",
4957 declaration = create_implicit_function(symbol,
4960 errorf(HERE, "unknown symbol '%Y' found.", symbol);
4961 return create_invalid_expression();
4965 type_t *type = declaration->type;
4967 /* we always do the auto-type conversions; the & and sizeof parser contains
4968 * code to revert this! */
4969 type = automatic_type_conversion(type);
4971 ref->declaration = declaration;
4972 ref->base.type = type;
4974 /* this declaration is used */
4975 declaration->used = true;
4977 /* check for deprecated functions */
4978 if(declaration->deprecated != 0) {
4979 const char *prefix = "";
4980 if (is_type_function(declaration->type))
4981 prefix = "function ";
4983 if (declaration->deprecated_string != NULL) {
4984 warningf(&source_position,
4985 "%s'%Y' was declared 'deprecated(\"%s\")'", prefix, declaration->symbol,
4986 declaration->deprecated_string);
4988 warningf(&source_position,
4989 "%s'%Y' was declared 'deprecated'", prefix, declaration->symbol);
4996 static void check_cast_allowed(expression_t *expression, type_t *dest_type)
5000 /* TODO check if explicit cast is allowed and issue warnings/errors */
5003 static expression_t *parse_compound_literal(type_t *type)
5005 expression_t *expression = allocate_expression_zero(EXPR_COMPOUND_LITERAL);
5007 parse_initializer_env_t env;
5009 env.declaration = NULL;
5010 env.must_be_constant = false;
5011 initializer_t *initializer = parse_initializer(&env);
5014 expression->compound_literal.initializer = initializer;
5015 expression->compound_literal.type = type;
5016 expression->base.type = automatic_type_conversion(type);
5022 * Parse a cast expression.
5024 static expression_t *parse_cast(void)
5026 source_position_t source_position = token.source_position;
5028 type_t *type = parse_typename();
5030 /* matching add_anchor_token() is at call site */
5031 rem_anchor_token(')');
5034 if(token.type == '{') {
5035 return parse_compound_literal(type);
5038 expression_t *cast = allocate_expression_zero(EXPR_UNARY_CAST);
5039 cast->base.source_position = source_position;
5041 expression_t *value = parse_sub_expression(20);
5043 check_cast_allowed(value, type);
5045 cast->base.type = type;
5046 cast->unary.value = value;
5050 return create_invalid_expression();
5054 * Parse a statement expression.
5056 static expression_t *parse_statement_expression(void)
5058 expression_t *expression = allocate_expression_zero(EXPR_STATEMENT);
5060 statement_t *statement = parse_compound_statement(true);
5061 expression->statement.statement = statement;
5062 expression->base.source_position = statement->base.source_position;
5064 /* find last statement and use its type */
5065 type_t *type = type_void;
5066 const statement_t *stmt = statement->compound.statements;
5068 while (stmt->base.next != NULL)
5069 stmt = stmt->base.next;
5071 if (stmt->kind == STATEMENT_EXPRESSION) {
5072 type = stmt->expression.expression->base.type;
5075 warningf(&expression->base.source_position, "empty statement expression ({})");
5077 expression->base.type = type;
5083 return create_invalid_expression();
5087 * Parse a braced expression.
5089 static expression_t *parse_brace_expression(void)
5092 add_anchor_token(')');
5094 switch(token.type) {
5096 /* gcc extension: a statement expression */
5097 return parse_statement_expression();
5101 return parse_cast();
5103 if(is_typedef_symbol(token.v.symbol)) {
5104 return parse_cast();
5108 expression_t *result = parse_expression();
5109 rem_anchor_token(')');
5114 return create_invalid_expression();
5117 static expression_t *parse_function_keyword(void)
5122 if (current_function == NULL) {
5123 errorf(HERE, "'__func__' used outside of a function");
5126 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5127 expression->base.type = type_char_ptr;
5128 expression->funcname.kind = FUNCNAME_FUNCTION;
5133 static expression_t *parse_pretty_function_keyword(void)
5135 eat(T___PRETTY_FUNCTION__);
5137 if (current_function == NULL) {
5138 errorf(HERE, "'__PRETTY_FUNCTION__' used outside of a function");
5141 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5142 expression->base.type = type_char_ptr;
5143 expression->funcname.kind = FUNCNAME_PRETTY_FUNCTION;
5148 static expression_t *parse_funcsig_keyword(void)
5152 if (current_function == NULL) {
5153 errorf(HERE, "'__FUNCSIG__' used outside of a function");
5156 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5157 expression->base.type = type_char_ptr;
5158 expression->funcname.kind = FUNCNAME_FUNCSIG;
5163 static expression_t *parse_funcdname_keyword(void)
5165 eat(T___FUNCDNAME__);
5167 if (current_function == NULL) {
5168 errorf(HERE, "'__FUNCDNAME__' used outside of a function");
5171 expression_t *expression = allocate_expression_zero(EXPR_FUNCNAME);
5172 expression->base.type = type_char_ptr;
5173 expression->funcname.kind = FUNCNAME_FUNCDNAME;
5178 static designator_t *parse_designator(void)
5180 designator_t *result = allocate_ast_zero(sizeof(result[0]));
5181 result->source_position = *HERE;
5183 if(token.type != T_IDENTIFIER) {
5184 parse_error_expected("while parsing member designator",
5185 T_IDENTIFIER, NULL);
5188 result->symbol = token.v.symbol;
5191 designator_t *last_designator = result;
5193 if(token.type == '.') {
5195 if(token.type != T_IDENTIFIER) {
5196 parse_error_expected("while parsing member designator",
5197 T_IDENTIFIER, NULL);
5200 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
5201 designator->source_position = *HERE;
5202 designator->symbol = token.v.symbol;
5205 last_designator->next = designator;
5206 last_designator = designator;
5209 if(token.type == '[') {
5211 add_anchor_token(']');
5212 designator_t *designator = allocate_ast_zero(sizeof(result[0]));
5213 designator->source_position = *HERE;
5214 designator->array_index = parse_expression();
5215 rem_anchor_token(']');
5217 if(designator->array_index == NULL) {
5221 last_designator->next = designator;
5222 last_designator = designator;
5234 * Parse the __builtin_offsetof() expression.
5236 static expression_t *parse_offsetof(void)
5238 eat(T___builtin_offsetof);
5240 expression_t *expression = allocate_expression_zero(EXPR_OFFSETOF);
5241 expression->base.type = type_size_t;
5244 add_anchor_token(',');
5245 type_t *type = parse_typename();
5246 rem_anchor_token(',');
5248 add_anchor_token(')');
5249 designator_t *designator = parse_designator();
5250 rem_anchor_token(')');
5253 expression->offsetofe.type = type;
5254 expression->offsetofe.designator = designator;
5257 memset(&path, 0, sizeof(path));
5258 path.top_type = type;
5259 path.path = NEW_ARR_F(type_path_entry_t, 0);
5261 descend_into_subtype(&path);
5263 if(!walk_designator(&path, designator, true)) {
5264 return create_invalid_expression();
5267 DEL_ARR_F(path.path);
5271 return create_invalid_expression();
5275 * Parses a _builtin_va_start() expression.
5277 static expression_t *parse_va_start(void)
5279 eat(T___builtin_va_start);
5281 expression_t *expression = allocate_expression_zero(EXPR_VA_START);
5284 add_anchor_token(',');
5285 expression->va_starte.ap = parse_assignment_expression();
5286 rem_anchor_token(',');
5288 expression_t *const expr = parse_assignment_expression();
5289 if (expr->kind == EXPR_REFERENCE) {
5290 declaration_t *const decl = expr->reference.declaration;
5292 return create_invalid_expression();
5293 if (decl->parent_scope == ¤t_function->scope &&
5294 decl->next == NULL) {
5295 expression->va_starte.parameter = decl;
5300 errorf(&expr->base.source_position,
5301 "second argument of 'va_start' must be last parameter of the current function");
5303 return create_invalid_expression();
5307 * Parses a _builtin_va_arg() expression.
5309 static expression_t *parse_va_arg(void)
5311 eat(T___builtin_va_arg);
5313 expression_t *expression = allocate_expression_zero(EXPR_VA_ARG);
5316 expression->va_arge.ap = parse_assignment_expression();
5318 expression->base.type = parse_typename();
5323 return create_invalid_expression();
5326 static expression_t *parse_builtin_symbol(void)
5328 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_SYMBOL);
5330 symbol_t *symbol = token.v.symbol;
5332 expression->builtin_symbol.symbol = symbol;
5335 type_t *type = get_builtin_symbol_type(symbol);
5336 type = automatic_type_conversion(type);
5338 expression->base.type = type;
5343 * Parses a __builtin_constant() expression.
5345 static expression_t *parse_builtin_constant(void)
5347 eat(T___builtin_constant_p);
5349 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_CONSTANT_P);
5352 add_anchor_token(')');
5353 expression->builtin_constant.value = parse_assignment_expression();
5354 rem_anchor_token(')');
5356 expression->base.type = type_int;
5360 return create_invalid_expression();
5364 * Parses a __builtin_prefetch() expression.
5366 static expression_t *parse_builtin_prefetch(void)
5368 eat(T___builtin_prefetch);
5370 expression_t *expression = allocate_expression_zero(EXPR_BUILTIN_PREFETCH);
5373 add_anchor_token(')');
5374 expression->builtin_prefetch.adr = parse_assignment_expression();
5375 if (token.type == ',') {
5377 expression->builtin_prefetch.rw = parse_assignment_expression();
5379 if (token.type == ',') {
5381 expression->builtin_prefetch.locality = parse_assignment_expression();
5383 rem_anchor_token(')');
5385 expression->base.type = type_void;
5389 return create_invalid_expression();
5393 * Parses a __builtin_is_*() compare expression.
5395 static expression_t *parse_compare_builtin(void)
5397 expression_t *expression;
5399 switch(token.type) {
5400 case T___builtin_isgreater:
5401 expression = allocate_expression_zero(EXPR_BINARY_ISGREATER);
5403 case T___builtin_isgreaterequal:
5404 expression = allocate_expression_zero(EXPR_BINARY_ISGREATEREQUAL);
5406 case T___builtin_isless:
5407 expression = allocate_expression_zero(EXPR_BINARY_ISLESS);
5409 case T___builtin_islessequal:
5410 expression = allocate_expression_zero(EXPR_BINARY_ISLESSEQUAL);
5412 case T___builtin_islessgreater:
5413 expression = allocate_expression_zero(EXPR_BINARY_ISLESSGREATER);
5415 case T___builtin_isunordered:
5416 expression = allocate_expression_zero(EXPR_BINARY_ISUNORDERED);
5419 internal_errorf(HERE, "invalid compare builtin found");
5422 expression->base.source_position = *HERE;
5426 expression->binary.left = parse_assignment_expression();
5428 expression->binary.right = parse_assignment_expression();
5431 type_t *const orig_type_left = expression->binary.left->base.type;
5432 type_t *const orig_type_right = expression->binary.right->base.type;
5434 type_t *const type_left = skip_typeref(orig_type_left);
5435 type_t *const type_right = skip_typeref(orig_type_right);
5436 if(!is_type_float(type_left) && !is_type_float(type_right)) {
5437 if (is_type_valid(type_left) && is_type_valid(type_right)) {
5438 type_error_incompatible("invalid operands in comparison",
5439 &expression->base.source_position, orig_type_left, orig_type_right);
5442 semantic_comparison(&expression->binary);
5447 return create_invalid_expression();
5451 * Parses a __builtin_expect() expression.
5453 static expression_t *parse_builtin_expect(void)
5455 eat(T___builtin_expect);
5457 expression_t *expression
5458 = allocate_expression_zero(EXPR_BINARY_BUILTIN_EXPECT);
5461 expression->binary.left = parse_assignment_expression();
5463 expression->binary.right = parse_constant_expression();
5466 expression->base.type = expression->binary.left->base.type;
5470 return create_invalid_expression();
5474 * Parses a MS assume() expression.
5476 static expression_t *parse_assume(void) {
5479 expression_t *expression
5480 = allocate_expression_zero(EXPR_UNARY_ASSUME);
5483 add_anchor_token(')');
5484 expression->unary.value = parse_assignment_expression();
5485 rem_anchor_token(')');
5488 expression->base.type = type_void;
5491 return create_invalid_expression();
5495 * Parse a microsoft __noop expression.
5497 static expression_t *parse_noop_expression(void) {
5498 source_position_t source_position = *HERE;
5501 if (token.type == '(') {
5502 /* parse arguments */
5504 add_anchor_token(')');
5505 add_anchor_token(',');
5507 if(token.type != ')') {
5509 (void)parse_assignment_expression();
5510 if(token.type != ',')
5516 rem_anchor_token(',');
5517 rem_anchor_token(')');
5520 /* the result is a (int)0 */
5521 expression_t *cnst = allocate_expression_zero(EXPR_CONST);
5522 cnst->base.source_position = source_position;
5523 cnst->base.type = type_int;
5524 cnst->conste.v.int_value = 0;
5525 cnst->conste.is_ms_noop = true;
5530 return create_invalid_expression();
5534 * Parses a primary expression.
5536 static expression_t *parse_primary_expression(void)
5538 switch (token.type) {
5539 case T_INTEGER: return parse_int_const();
5540 case T_CHARACTER_CONSTANT: return parse_character_constant();
5541 case T_WIDE_CHARACTER_CONSTANT: return parse_wide_character_constant();
5542 case T_FLOATINGPOINT: return parse_float_const();
5543 case T_STRING_LITERAL:
5544 case T_WIDE_STRING_LITERAL: return parse_string_const();
5545 case T_IDENTIFIER: return parse_reference();
5546 case T___FUNCTION__:
5547 case T___func__: return parse_function_keyword();
5548 case T___PRETTY_FUNCTION__: return parse_pretty_function_keyword();
5549 case T___FUNCSIG__: return parse_funcsig_keyword();
5550 case T___FUNCDNAME__: return parse_funcdname_keyword();
5551 case T___builtin_offsetof: return parse_offsetof();
5552 case T___builtin_va_start: return parse_va_start();
5553 case T___builtin_va_arg: return parse_va_arg();
5554 case T___builtin_expect: return parse_builtin_expect();
5555 case T___builtin_alloca:
5556 case T___builtin_nan:
5557 case T___builtin_nand:
5558 case T___builtin_nanf:
5559 case T___builtin_huge_val:
5560 case T___builtin_va_end: return parse_builtin_symbol();
5561 case T___builtin_isgreater:
5562 case T___builtin_isgreaterequal:
5563 case T___builtin_isless:
5564 case T___builtin_islessequal:
5565 case T___builtin_islessgreater:
5566 case T___builtin_isunordered: return parse_compare_builtin();
5567 case T___builtin_constant_p: return parse_builtin_constant();
5568 case T___builtin_prefetch: return parse_builtin_prefetch();
5569 case T__assume: return parse_assume();
5571 case '(': return parse_brace_expression();
5572 case T___noop: return parse_noop_expression();
5575 errorf(HERE, "unexpected token %K, expected an expression", &token);
5576 return create_invalid_expression();
5580 * Check if the expression has the character type and issue a warning then.
5582 static void check_for_char_index_type(const expression_t *expression) {
5583 type_t *const type = expression->base.type;
5584 const type_t *const base_type = skip_typeref(type);
5586 if (is_type_atomic(base_type, ATOMIC_TYPE_CHAR) &&
5587 warning.char_subscripts) {
5588 warningf(&expression->base.source_position,
5589 "array subscript has type '%T'", type);
5593 static expression_t *parse_array_expression(unsigned precedence,
5599 add_anchor_token(']');
5601 expression_t *inside = parse_expression();
5603 expression_t *expression = allocate_expression_zero(EXPR_ARRAY_ACCESS);
5605 array_access_expression_t *array_access = &expression->array_access;
5607 type_t *const orig_type_left = left->base.type;
5608 type_t *const orig_type_inside = inside->base.type;
5610 type_t *const type_left = skip_typeref(orig_type_left);
5611 type_t *const type_inside = skip_typeref(orig_type_inside);
5613 type_t *return_type;
5614 if (is_type_pointer(type_left)) {
5615 return_type = type_left->pointer.points_to;
5616 array_access->array_ref = left;
5617 array_access->index = inside;
5618 check_for_char_index_type(inside);
5619 } else if (is_type_pointer(type_inside)) {
5620 return_type = type_inside->pointer.points_to;
5621 array_access->array_ref = inside;
5622 array_access->index = left;
5623 array_access->flipped = true;
5624 check_for_char_index_type(left);
5626 if (is_type_valid(type_left) && is_type_valid(type_inside)) {
5628 "array access on object with non-pointer types '%T', '%T'",
5629 orig_type_left, orig_type_inside);
5631 return_type = type_error_type;
5632 array_access->array_ref = create_invalid_expression();
5635 rem_anchor_token(']');
5636 if(token.type != ']') {
5637 parse_error_expected("Problem while parsing array access", ']', NULL);
5642 return_type = automatic_type_conversion(return_type);
5643 expression->base.type = return_type;
5648 static expression_t *parse_typeprop(expression_kind_t kind, unsigned precedence)
5650 expression_t *tp_expression = allocate_expression_zero(kind);
5651 tp_expression->base.type = type_size_t;
5653 if(token.type == '(' && is_declaration_specifier(look_ahead(1), true)) {
5655 add_anchor_token(')');
5656 tp_expression->typeprop.type = parse_typename();
5657 rem_anchor_token(')');
5660 expression_t *expression = parse_sub_expression(precedence);
5661 expression->base.type = revert_automatic_type_conversion(expression);
5663 tp_expression->typeprop.type = expression->base.type;
5664 tp_expression->typeprop.tp_expression = expression;
5667 return tp_expression;
5669 return create_invalid_expression();
5672 static expression_t *parse_sizeof(unsigned precedence)
5675 return parse_typeprop(EXPR_SIZEOF, precedence);
5678 static expression_t *parse_alignof(unsigned precedence)
5681 return parse_typeprop(EXPR_SIZEOF, precedence);
5684 static expression_t *parse_select_expression(unsigned precedence,
5685 expression_t *compound)
5688 assert(token.type == '.' || token.type == T_MINUSGREATER);
5690 bool is_pointer = (token.type == T_MINUSGREATER);
5693 expression_t *select = allocate_expression_zero(EXPR_SELECT);
5694 select->select.compound = compound;
5696 if(token.type != T_IDENTIFIER) {
5697 parse_error_expected("while parsing select", T_IDENTIFIER, NULL);
5700 symbol_t *symbol = token.v.symbol;
5701 select->select.symbol = symbol;
5704 type_t *const orig_type = compound->base.type;
5705 type_t *const type = skip_typeref(orig_type);
5707 type_t *type_left = type;
5709 if (!is_type_pointer(type)) {
5710 if (is_type_valid(type)) {
5711 errorf(HERE, "left hand side of '->' is not a pointer, but '%T'", orig_type);
5713 return create_invalid_expression();
5715 type_left = type->pointer.points_to;
5717 type_left = skip_typeref(type_left);
5719 if (type_left->kind != TYPE_COMPOUND_STRUCT &&
5720 type_left->kind != TYPE_COMPOUND_UNION) {
5721 if (is_type_valid(type_left)) {
5722 errorf(HERE, "request for member '%Y' in something not a struct or "
5723 "union, but '%T'", symbol, type_left);
5725 return create_invalid_expression();
5728 declaration_t *const declaration = type_left->compound.declaration;
5730 if(!declaration->init.complete) {
5731 errorf(HERE, "request for member '%Y' of incomplete type '%T'",
5733 return create_invalid_expression();
5736 declaration_t *iter = find_compound_entry(declaration, symbol);
5738 errorf(HERE, "'%T' has no member named '%Y'", orig_type, symbol);
5739 return create_invalid_expression();
5742 /* we always do the auto-type conversions; the & and sizeof parser contains
5743 * code to revert this! */
5744 type_t *expression_type = automatic_type_conversion(iter->type);
5746 select->select.compound_entry = iter;
5747 select->base.type = expression_type;
5749 if(expression_type->kind == TYPE_BITFIELD) {
5750 expression_t *extract
5751 = allocate_expression_zero(EXPR_UNARY_BITFIELD_EXTRACT);
5752 extract->unary.value = select;
5753 extract->base.type = expression_type->bitfield.base_type;
5762 * Parse a call expression, ie. expression '( ... )'.
5764 * @param expression the function address
5766 static expression_t *parse_call_expression(unsigned precedence,
5767 expression_t *expression)
5770 expression_t *result = allocate_expression_zero(EXPR_CALL);
5771 result->base.source_position = expression->base.source_position;
5773 call_expression_t *call = &result->call;
5774 call->function = expression;
5776 type_t *const orig_type = expression->base.type;
5777 type_t *const type = skip_typeref(orig_type);
5779 function_type_t *function_type = NULL;
5780 if (is_type_pointer(type)) {
5781 type_t *const to_type = skip_typeref(type->pointer.points_to);
5783 if (is_type_function(to_type)) {
5784 function_type = &to_type->function;
5785 call->base.type = function_type->return_type;
5789 if (function_type == NULL && is_type_valid(type)) {
5790 errorf(HERE, "called object '%E' (type '%T') is not a pointer to a function", expression, orig_type);
5793 /* parse arguments */
5795 add_anchor_token(')');
5796 add_anchor_token(',');
5798 if(token.type != ')') {
5799 call_argument_t *last_argument = NULL;
5802 call_argument_t *argument = allocate_ast_zero(sizeof(argument[0]));
5804 argument->expression = parse_assignment_expression();
5805 if(last_argument == NULL) {
5806 call->arguments = argument;
5808 last_argument->next = argument;
5810 last_argument = argument;
5812 if(token.type != ',')
5817 rem_anchor_token(',');
5818 rem_anchor_token(')');
5821 if(function_type != NULL) {
5822 function_parameter_t *parameter = function_type->parameters;
5823 call_argument_t *argument = call->arguments;
5824 for( ; parameter != NULL && argument != NULL;
5825 parameter = parameter->next, argument = argument->next) {
5826 type_t *expected_type = parameter->type;
5827 /* TODO report scope in error messages */
5828 expression_t *const arg_expr = argument->expression;
5829 type_t *const res_type = semantic_assign(expected_type, arg_expr,
5831 &arg_expr->base.source_position);
5832 if (res_type == NULL) {
5833 /* TODO improve error message */
5834 errorf(&arg_expr->base.source_position,
5835 "Cannot call function with argument '%E' of type '%T' where type '%T' is expected",
5836 arg_expr, arg_expr->base.type, expected_type);
5838 argument->expression = create_implicit_cast(argument->expression, expected_type);
5841 /* too few parameters */
5842 if(parameter != NULL) {
5843 errorf(HERE, "too few arguments to function '%E'", expression);
5844 } else if(argument != NULL) {
5845 /* too many parameters */
5846 if(!function_type->variadic
5847 && !function_type->unspecified_parameters) {
5848 errorf(HERE, "too many arguments to function '%E'", expression);
5850 /* do default promotion */
5851 for( ; argument != NULL; argument = argument->next) {
5852 type_t *type = argument->expression->base.type;
5854 type = skip_typeref(type);
5855 if(is_type_integer(type)) {
5856 type = promote_integer(type);
5857 } else if(type == type_float) {
5861 argument->expression
5862 = create_implicit_cast(argument->expression, type);
5865 check_format(&result->call);
5868 check_format(&result->call);
5874 return create_invalid_expression();
5877 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right);
5879 static bool same_compound_type(const type_t *type1, const type_t *type2)
5882 is_type_compound(type1) &&
5883 type1->kind == type2->kind &&
5884 type1->compound.declaration == type2->compound.declaration;
5888 * Parse a conditional expression, ie. 'expression ? ... : ...'.
5890 * @param expression the conditional expression
5892 static expression_t *parse_conditional_expression(unsigned precedence,
5893 expression_t *expression)
5896 add_anchor_token(':');
5898 expression_t *result = allocate_expression_zero(EXPR_CONDITIONAL);
5900 conditional_expression_t *conditional = &result->conditional;
5901 conditional->condition = expression;
5904 type_t *const condition_type_orig = expression->base.type;
5905 type_t *const condition_type = skip_typeref(condition_type_orig);
5906 if (!is_type_scalar(condition_type) && is_type_valid(condition_type)) {
5907 type_error("expected a scalar type in conditional condition",
5908 &expression->base.source_position, condition_type_orig);
5911 expression_t *true_expression = parse_expression();
5912 rem_anchor_token(':');
5914 expression_t *false_expression = parse_sub_expression(precedence);
5916 type_t *const orig_true_type = true_expression->base.type;
5917 type_t *const orig_false_type = false_expression->base.type;
5918 type_t *const true_type = skip_typeref(orig_true_type);
5919 type_t *const false_type = skip_typeref(orig_false_type);
5922 type_t *result_type;
5923 if(is_type_atomic(true_type, ATOMIC_TYPE_VOID) ||
5924 is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
5925 if (!is_type_atomic(true_type, ATOMIC_TYPE_VOID)
5926 || !is_type_atomic(false_type, ATOMIC_TYPE_VOID)) {
5927 warningf(&expression->base.source_position,
5928 "ISO C forbids conditional expression with only one void side");
5930 result_type = type_void;
5931 } else if (is_type_arithmetic(true_type)
5932 && is_type_arithmetic(false_type)) {
5933 result_type = semantic_arithmetic(true_type, false_type);
5935 true_expression = create_implicit_cast(true_expression, result_type);
5936 false_expression = create_implicit_cast(false_expression, result_type);
5938 conditional->true_expression = true_expression;
5939 conditional->false_expression = false_expression;
5940 conditional->base.type = result_type;
5941 } else if (same_compound_type(true_type, false_type)) {
5942 /* just take 1 of the 2 types */
5943 result_type = true_type;
5944 } else if (is_type_pointer(true_type) || is_type_pointer(false_type)) {
5945 type_t *pointer_type;
5947 expression_t *other_expression;
5948 if (is_type_pointer(true_type)) {
5949 pointer_type = true_type;
5950 other_type = false_type;
5951 other_expression = false_expression;
5953 pointer_type = false_type;
5954 other_type = true_type;
5955 other_expression = true_expression;
5958 if(is_type_pointer(other_type)) {
5959 if(!pointers_compatible(true_type, false_type)) {
5960 warningf(&expression->base.source_position,
5961 "pointer types '%T' and '%T' in conditional expression are incompatible", true_type, false_type);
5963 result_type = true_type;
5964 } else if(is_null_pointer_constant(other_expression)) {
5965 result_type = pointer_type;
5966 } else if(is_type_integer(other_type)) {
5967 warningf(&expression->base.source_position,
5968 "pointer/integer type mismatch in conditional expression ('%T' and '%T')", true_type, false_type);
5969 result_type = pointer_type;
5971 type_error_incompatible("while parsing conditional",
5972 &expression->base.source_position, true_type, false_type);
5973 result_type = type_error_type;
5976 /* TODO: one pointer to void*, other some pointer */
5978 if (is_type_valid(true_type) && is_type_valid(false_type)) {
5979 type_error_incompatible("while parsing conditional",
5980 &expression->base.source_position, true_type,
5983 result_type = type_error_type;
5986 conditional->true_expression
5987 = create_implicit_cast(true_expression, result_type);
5988 conditional->false_expression
5989 = create_implicit_cast(false_expression, result_type);
5990 conditional->base.type = result_type;
5993 return create_invalid_expression();
5997 * Parse an extension expression.
5999 static expression_t *parse_extension(unsigned precedence)
6001 eat(T___extension__);
6003 /* TODO enable extensions */
6004 expression_t *expression = parse_sub_expression(precedence);
6005 /* TODO disable extensions */
6010 * Parse a __builtin_classify_type() expression.
6012 static expression_t *parse_builtin_classify_type(const unsigned precedence)
6014 eat(T___builtin_classify_type);
6016 expression_t *result = allocate_expression_zero(EXPR_CLASSIFY_TYPE);
6017 result->base.type = type_int;
6020 add_anchor_token(')');
6021 expression_t *expression = parse_sub_expression(precedence);
6022 rem_anchor_token(')');
6024 result->classify_type.type_expression = expression;
6028 return create_invalid_expression();
6031 static void semantic_incdec(unary_expression_t *expression)
6033 type_t *const orig_type = expression->value->base.type;
6034 type_t *const type = skip_typeref(orig_type);
6035 /* TODO !is_type_real && !is_type_pointer */
6036 if(!is_type_arithmetic(type) && type->kind != TYPE_POINTER) {
6037 if (is_type_valid(type)) {
6038 /* TODO: improve error message */
6039 errorf(HERE, "operation needs an arithmetic or pointer type");
6044 expression->base.type = orig_type;
6047 static void semantic_unexpr_arithmetic(unary_expression_t *expression)
6049 type_t *const orig_type = expression->value->base.type;
6050 type_t *const type = skip_typeref(orig_type);
6051 if(!is_type_arithmetic(type)) {
6052 if (is_type_valid(type)) {
6053 /* TODO: improve error message */
6054 errorf(HERE, "operation needs an arithmetic type");
6059 expression->base.type = orig_type;
6062 static void semantic_unexpr_scalar(unary_expression_t *expression)
6064 type_t *const orig_type = expression->value->base.type;
6065 type_t *const type = skip_typeref(orig_type);
6066 if (!is_type_scalar(type)) {
6067 if (is_type_valid(type)) {
6068 errorf(HERE, "operand of ! must be of scalar type");
6073 expression->base.type = orig_type;
6076 static void semantic_unexpr_integer(unary_expression_t *expression)
6078 type_t *const orig_type = expression->value->base.type;
6079 type_t *const type = skip_typeref(orig_type);
6080 if (!is_type_integer(type)) {
6081 if (is_type_valid(type)) {
6082 errorf(HERE, "operand of ~ must be of integer type");
6087 expression->base.type = orig_type;
6090 static void semantic_dereference(unary_expression_t *expression)
6092 type_t *const orig_type = expression->value->base.type;
6093 type_t *const type = skip_typeref(orig_type);
6094 if(!is_type_pointer(type)) {
6095 if (is_type_valid(type)) {
6096 errorf(HERE, "Unary '*' needs pointer or arrray type, but type '%T' given", orig_type);
6101 type_t *result_type = type->pointer.points_to;
6102 result_type = automatic_type_conversion(result_type);
6103 expression->base.type = result_type;
6107 * Check the semantic of the address taken expression.
6109 static void semantic_take_addr(unary_expression_t *expression)
6111 expression_t *value = expression->value;
6112 value->base.type = revert_automatic_type_conversion(value);
6114 type_t *orig_type = value->base.type;
6115 if(!is_type_valid(orig_type))
6118 if(value->kind == EXPR_REFERENCE) {
6119 declaration_t *const declaration = value->reference.declaration;
6120 if(declaration != NULL) {
6121 if (declaration->storage_class == STORAGE_CLASS_REGISTER) {
6122 errorf(&expression->base.source_position,
6123 "address of register variable '%Y' requested",
6124 declaration->symbol);
6126 declaration->address_taken = 1;
6130 expression->base.type = make_pointer_type(orig_type, TYPE_QUALIFIER_NONE);
6133 #define CREATE_UNARY_EXPRESSION_PARSER(token_type, unexpression_type, sfunc) \
6134 static expression_t *parse_##unexpression_type(unsigned precedence) \
6138 expression_t *unary_expression \
6139 = allocate_expression_zero(unexpression_type); \
6140 unary_expression->base.source_position = *HERE; \
6141 unary_expression->unary.value = parse_sub_expression(precedence); \
6143 sfunc(&unary_expression->unary); \
6145 return unary_expression; \
6148 CREATE_UNARY_EXPRESSION_PARSER('-', EXPR_UNARY_NEGATE,
6149 semantic_unexpr_arithmetic)
6150 CREATE_UNARY_EXPRESSION_PARSER('+', EXPR_UNARY_PLUS,
6151 semantic_unexpr_arithmetic)
6152 CREATE_UNARY_EXPRESSION_PARSER('!', EXPR_UNARY_NOT,
6153 semantic_unexpr_scalar)
6154 CREATE_UNARY_EXPRESSION_PARSER('*', EXPR_UNARY_DEREFERENCE,
6155 semantic_dereference)
6156 CREATE_UNARY_EXPRESSION_PARSER('&', EXPR_UNARY_TAKE_ADDRESS,
6158 CREATE_UNARY_EXPRESSION_PARSER('~', EXPR_UNARY_BITWISE_NEGATE,
6159 semantic_unexpr_integer)
6160 CREATE_UNARY_EXPRESSION_PARSER(T_PLUSPLUS, EXPR_UNARY_PREFIX_INCREMENT,
6162 CREATE_UNARY_EXPRESSION_PARSER(T_MINUSMINUS, EXPR_UNARY_PREFIX_DECREMENT,
6165 #define CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(token_type, unexpression_type, \
6167 static expression_t *parse_##unexpression_type(unsigned precedence, \
6168 expression_t *left) \
6170 (void) precedence; \
6173 expression_t *unary_expression \
6174 = allocate_expression_zero(unexpression_type); \
6175 unary_expression->unary.value = left; \
6177 sfunc(&unary_expression->unary); \
6179 return unary_expression; \
6182 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_PLUSPLUS,
6183 EXPR_UNARY_POSTFIX_INCREMENT,
6185 CREATE_UNARY_POSTFIX_EXPRESSION_PARSER(T_MINUSMINUS,
6186 EXPR_UNARY_POSTFIX_DECREMENT,
6189 static type_t *semantic_arithmetic(type_t *type_left, type_t *type_right)
6191 /* TODO: handle complex + imaginary types */
6193 /* § 6.3.1.8 Usual arithmetic conversions */
6194 if(type_left == type_long_double || type_right == type_long_double) {
6195 return type_long_double;
6196 } else if(type_left == type_double || type_right == type_double) {
6198 } else if(type_left == type_float || type_right == type_float) {
6202 type_right = promote_integer(type_right);
6203 type_left = promote_integer(type_left);
6205 if(type_left == type_right)
6208 bool signed_left = is_type_signed(type_left);
6209 bool signed_right = is_type_signed(type_right);
6210 int rank_left = get_rank(type_left);
6211 int rank_right = get_rank(type_right);
6212 if(rank_left < rank_right) {
6213 if(signed_left == signed_right || !signed_right) {
6219 if(signed_left == signed_right || !signed_left) {
6228 * Check the semantic restrictions for a binary expression.
6230 static void semantic_binexpr_arithmetic(binary_expression_t *expression)
6232 expression_t *const left = expression->left;
6233 expression_t *const right = expression->right;
6234 type_t *const orig_type_left = left->base.type;
6235 type_t *const orig_type_right = right->base.type;
6236 type_t *const type_left = skip_typeref(orig_type_left);
6237 type_t *const type_right = skip_typeref(orig_type_right);
6239 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
6240 /* TODO: improve error message */
6241 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6242 errorf(HERE, "operation needs arithmetic types");
6247 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6248 expression->left = create_implicit_cast(left, arithmetic_type);
6249 expression->right = create_implicit_cast(right, arithmetic_type);
6250 expression->base.type = arithmetic_type;
6253 static void semantic_shift_op(binary_expression_t *expression)
6255 expression_t *const left = expression->left;
6256 expression_t *const right = expression->right;
6257 type_t *const orig_type_left = left->base.type;
6258 type_t *const orig_type_right = right->base.type;
6259 type_t * type_left = skip_typeref(orig_type_left);
6260 type_t * type_right = skip_typeref(orig_type_right);
6262 if(!is_type_integer(type_left) || !is_type_integer(type_right)) {
6263 /* TODO: improve error message */
6264 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6265 errorf(HERE, "operation needs integer types");
6270 type_left = promote_integer(type_left);
6271 type_right = promote_integer(type_right);
6273 expression->left = create_implicit_cast(left, type_left);
6274 expression->right = create_implicit_cast(right, type_right);
6275 expression->base.type = type_left;
6278 static void semantic_add(binary_expression_t *expression)
6280 expression_t *const left = expression->left;
6281 expression_t *const right = expression->right;
6282 type_t *const orig_type_left = left->base.type;
6283 type_t *const orig_type_right = right->base.type;
6284 type_t *const type_left = skip_typeref(orig_type_left);
6285 type_t *const type_right = skip_typeref(orig_type_right);
6288 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6289 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6290 expression->left = create_implicit_cast(left, arithmetic_type);
6291 expression->right = create_implicit_cast(right, arithmetic_type);
6292 expression->base.type = arithmetic_type;
6294 } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
6295 expression->base.type = type_left;
6296 } else if(is_type_pointer(type_right) && is_type_integer(type_left)) {
6297 expression->base.type = type_right;
6298 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6299 errorf(HERE, "invalid operands to binary + ('%T', '%T')", orig_type_left, orig_type_right);
6303 static void semantic_sub(binary_expression_t *expression)
6305 expression_t *const left = expression->left;
6306 expression_t *const right = expression->right;
6307 type_t *const orig_type_left = left->base.type;
6308 type_t *const orig_type_right = right->base.type;
6309 type_t *const type_left = skip_typeref(orig_type_left);
6310 type_t *const type_right = skip_typeref(orig_type_right);
6313 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6314 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6315 expression->left = create_implicit_cast(left, arithmetic_type);
6316 expression->right = create_implicit_cast(right, arithmetic_type);
6317 expression->base.type = arithmetic_type;
6319 } else if(is_type_pointer(type_left) && is_type_integer(type_right)) {
6320 expression->base.type = type_left;
6321 } else if(is_type_pointer(type_left) && is_type_pointer(type_right)) {
6322 if(!pointers_compatible(type_left, type_right)) {
6324 "pointers to incompatible objects to binary '-' ('%T', '%T')",
6325 orig_type_left, orig_type_right);
6327 expression->base.type = type_ptrdiff_t;
6329 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6330 errorf(HERE, "invalid operands to binary '-' ('%T', '%T')",
6331 orig_type_left, orig_type_right);
6336 * Check the semantics of comparison expressions.
6338 * @param expression The expression to check.
6340 static void semantic_comparison(binary_expression_t *expression)
6342 expression_t *left = expression->left;
6343 expression_t *right = expression->right;
6344 type_t *orig_type_left = left->base.type;
6345 type_t *orig_type_right = right->base.type;
6347 type_t *type_left = skip_typeref(orig_type_left);
6348 type_t *type_right = skip_typeref(orig_type_right);
6350 /* TODO non-arithmetic types */
6351 if(is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6352 /* test for signed vs unsigned compares */
6353 if (warning.sign_compare &&
6354 (expression->base.kind != EXPR_BINARY_EQUAL &&
6355 expression->base.kind != EXPR_BINARY_NOTEQUAL) &&
6356 (is_type_signed(type_left) != is_type_signed(type_right))) {
6358 /* check if 1 of the operands is a constant, in this case we just
6359 * check wether we can safely represent the resulting constant in
6360 * the type of the other operand. */
6361 expression_t *const_expr = NULL;
6362 expression_t *other_expr = NULL;
6364 if(is_constant_expression(left)) {
6367 } else if(is_constant_expression(right)) {
6372 if(const_expr != NULL) {
6373 type_t *other_type = skip_typeref(other_expr->base.type);
6374 long val = fold_constant(const_expr);
6375 /* TODO: check if val can be represented by other_type */
6379 warningf(&expression->base.source_position,
6380 "comparison between signed and unsigned");
6382 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6383 expression->left = create_implicit_cast(left, arithmetic_type);
6384 expression->right = create_implicit_cast(right, arithmetic_type);
6385 expression->base.type = arithmetic_type;
6386 if (warning.float_equal &&
6387 (expression->base.kind == EXPR_BINARY_EQUAL ||
6388 expression->base.kind == EXPR_BINARY_NOTEQUAL) &&
6389 is_type_float(arithmetic_type)) {
6390 warningf(&expression->base.source_position,
6391 "comparing floating point with == or != is unsafe");
6393 } else if (is_type_pointer(type_left) && is_type_pointer(type_right)) {
6394 /* TODO check compatibility */
6395 } else if (is_type_pointer(type_left)) {
6396 expression->right = create_implicit_cast(right, type_left);
6397 } else if (is_type_pointer(type_right)) {
6398 expression->left = create_implicit_cast(left, type_right);
6399 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6400 type_error_incompatible("invalid operands in comparison",
6401 &expression->base.source_position,
6402 type_left, type_right);
6404 expression->base.type = type_int;
6407 static void semantic_arithmetic_assign(binary_expression_t *expression)
6409 expression_t *left = expression->left;
6410 expression_t *right = expression->right;
6411 type_t *orig_type_left = left->base.type;
6412 type_t *orig_type_right = right->base.type;
6414 type_t *type_left = skip_typeref(orig_type_left);
6415 type_t *type_right = skip_typeref(orig_type_right);
6417 if(!is_type_arithmetic(type_left) || !is_type_arithmetic(type_right)) {
6418 /* TODO: improve error message */
6419 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6420 errorf(HERE, "operation needs arithmetic types");
6425 /* combined instructions are tricky. We can't create an implicit cast on
6426 * the left side, because we need the uncasted form for the store.
6427 * The ast2firm pass has to know that left_type must be right_type
6428 * for the arithmetic operation and create a cast by itself */
6429 type_t *arithmetic_type = semantic_arithmetic(type_left, type_right);
6430 expression->right = create_implicit_cast(right, arithmetic_type);
6431 expression->base.type = type_left;
6434 static void semantic_arithmetic_addsubb_assign(binary_expression_t *expression)
6436 expression_t *const left = expression->left;
6437 expression_t *const right = expression->right;
6438 type_t *const orig_type_left = left->base.type;
6439 type_t *const orig_type_right = right->base.type;
6440 type_t *const type_left = skip_typeref(orig_type_left);
6441 type_t *const type_right = skip_typeref(orig_type_right);
6443 if (is_type_arithmetic(type_left) && is_type_arithmetic(type_right)) {
6444 /* combined instructions are tricky. We can't create an implicit cast on
6445 * the left side, because we need the uncasted form for the store.
6446 * The ast2firm pass has to know that left_type must be right_type
6447 * for the arithmetic operation and create a cast by itself */
6448 type_t *const arithmetic_type = semantic_arithmetic(type_left, type_right);
6449 expression->right = create_implicit_cast(right, arithmetic_type);
6450 expression->base.type = type_left;
6451 } else if (is_type_pointer(type_left) && is_type_integer(type_right)) {
6452 expression->base.type = type_left;
6453 } else if (is_type_valid(type_left) && is_type_valid(type_right)) {
6454 errorf(HERE, "incompatible types '%T' and '%T' in assignment", orig_type_left, orig_type_right);
6459 * Check the semantic restrictions of a logical expression.
6461 static void semantic_logical_op(binary_expression_t *expression)
6463 expression_t *const left = expression->left;
6464 expression_t *const right = expression->right;
6465 type_t *const orig_type_left = left->base.type;
6466 type_t *const orig_type_right = right->base.type;
6467 type_t *const type_left = skip_typeref(orig_type_left);
6468 type_t *const type_right = skip_typeref(orig_type_right);
6470 if (!is_type_scalar(type_left) || !is_type_scalar(type_right)) {
6471 /* TODO: improve error message */
6472 if (is_type_valid(type_left) && is_type_valid(type_right)) {
6473 errorf(HERE, "operation needs scalar types");
6478 expression->base.type = type_int;
6482 * Checks if a compound type has constant fields.
6484 static bool has_const_fields(const compound_type_t *type)
6486 const scope_t *scope = &type->declaration->scope;
6487 const declaration_t *declaration = scope->declarations;
6489 for (; declaration != NULL; declaration = declaration->next) {
6490 if (declaration->namespc != NAMESPACE_NORMAL)
6493 const type_t *decl_type = skip_typeref(declaration->type);
6494 if (decl_type->base.qualifiers & TYPE_QUALIFIER_CONST)
6502 * Check the semantic restrictions of a binary assign expression.
6504 static void semantic_binexpr_assign(binary_expression_t *expression)
6506 expression_t *left = expression->left;
6507 type_t *orig_type_left = left->base.type;
6509 type_t *type_left = revert_automatic_type_conversion(left);
6510 type_left = skip_typeref(orig_type_left);
6512 /* must be a modifiable lvalue */
6513 if (is_type_array(type_left)) {
6514 errorf(HERE, "cannot assign to arrays ('%E')", left);
6517 if(type_left->base.qualifiers & TYPE_QUALIFIER_CONST) {
6518 errorf(HERE, "assignment to readonly location '%E' (type '%T')", left,
6522 if(is_type_incomplete(type_left)) {
6524 "left-hand side of assignment '%E' has incomplete type '%T'",
6525 left, orig_type_left);
6528 if(is_type_compound(type_left) && has_const_fields(&type_left->compound)) {
6529 errorf(HERE, "cannot assign to '%E' because compound type '%T' has readonly fields",
6530 left, orig_type_left);
6534 type_t *const res_type = semantic_assign(orig_type_left, expression->right,
6535 "assignment", &left->base.source_position);
6536 if (res_type == NULL) {
6537 errorf(&expression->base.source_position,
6538 "cannot assign to '%T' from '%T'",
6539 orig_type_left, expression->right->base.type);
6541 expression->right = create_implicit_cast(expression->right, res_type);
6544 expression->base.type = orig_type_left;
6548 * Determine if the outermost operation (or parts thereof) of the given
6549 * expression has no effect in order to generate a warning about this fact.
6550 * Therefore in some cases this only examines some of the operands of the
6551 * expression (see comments in the function and examples below).
6553 * f() + 23; // warning, because + has no effect
6554 * x || f(); // no warning, because x controls execution of f()
6555 * x ? y : f(); // warning, because y has no effect
6556 * (void)x; // no warning to be able to suppress the warning
6557 * This function can NOT be used for an "expression has definitely no effect"-
6559 static bool expression_has_effect(const expression_t *const expr)
6561 switch (expr->kind) {
6562 case EXPR_UNKNOWN: break;
6563 case EXPR_INVALID: return true; /* do NOT warn */
6564 case EXPR_REFERENCE: return false;
6565 /* suppress the warning for microsoft __noop operations */
6566 case EXPR_CONST: return expr->conste.is_ms_noop;
6567 case EXPR_CHARACTER_CONSTANT: return false;
6568 case EXPR_WIDE_CHARACTER_CONSTANT: return false;
6569 case EXPR_STRING_LITERAL: return false;
6570 case EXPR_WIDE_STRING_LITERAL: return false;
6573 const call_expression_t *const call = &expr->call;
6574 if (call->function->kind != EXPR_BUILTIN_SYMBOL)
6577 switch (call->function->builtin_symbol.symbol->ID) {
6578 case T___builtin_va_end: return true;
6579 default: return false;
6583 /* Generate the warning if either the left or right hand side of a
6584 * conditional expression has no effect */
6585 case EXPR_CONDITIONAL: {
6586 const conditional_expression_t *const cond = &expr->conditional;
6588 expression_has_effect(cond->true_expression) &&
6589 expression_has_effect(cond->false_expression);
6592 case EXPR_SELECT: return false;
6593 case EXPR_ARRAY_ACCESS: return false;
6594 case EXPR_SIZEOF: return false;
6595 case EXPR_CLASSIFY_TYPE: return false;
6596 case EXPR_ALIGNOF: return false;
6598 case EXPR_FUNCNAME: return false;
6599 case EXPR_BUILTIN_SYMBOL: break; /* handled in EXPR_CALL */
6600 case EXPR_BUILTIN_CONSTANT_P: return false;
6601 case EXPR_BUILTIN_PREFETCH: return true;
6602 case EXPR_OFFSETOF: return false;
6603 case EXPR_VA_START: return true;
6604 case EXPR_VA_ARG: return true;
6605 case EXPR_STATEMENT: return true; // TODO
6606 case EXPR_COMPOUND_LITERAL: return false;
6608 case EXPR_UNARY_NEGATE: return false;
6609 case EXPR_UNARY_PLUS: return false;
6610 case EXPR_UNARY_BITWISE_NEGATE: return false;
6611 case EXPR_UNARY_NOT: return false;
6612 case EXPR_UNARY_DEREFERENCE: return false;
6613 case EXPR_UNARY_TAKE_ADDRESS: return false;
6614 case EXPR_UNARY_POSTFIX_INCREMENT: return true;
6615 case EXPR_UNARY_POSTFIX_DECREMENT: return true;
6616 case EXPR_UNARY_PREFIX_INCREMENT: return true;
6617 case EXPR_UNARY_PREFIX_DECREMENT: return true;
6619 /* Treat void casts as if they have an effect in order to being able to
6620 * suppress the warning */
6621 case EXPR_UNARY_CAST: {
6622 type_t *const type = skip_typeref(expr->base.type);
6623 return is_type_atomic(type, ATOMIC_TYPE_VOID);
6626 case EXPR_UNARY_CAST_IMPLICIT: return true;
6627 case EXPR_UNARY_ASSUME: return true;
6628 case EXPR_UNARY_BITFIELD_EXTRACT: return false;
6630 case EXPR_BINARY_ADD: return false;
6631 case EXPR_BINARY_SUB: return false;
6632 case EXPR_BINARY_MUL: return false;
6633 case EXPR_BINARY_DIV: return false;
6634 case EXPR_BINARY_MOD: return false;
6635 case EXPR_BINARY_EQUAL: return false;
6636 case EXPR_BINARY_NOTEQUAL: return false;
6637 case EXPR_BINARY_LESS: return false;
6638 case EXPR_BINARY_LESSEQUAL: return false;
6639 case EXPR_BINARY_GREATER: return false;
6640 case EXPR_BINARY_GREATEREQUAL: return false;
6641 case EXPR_BINARY_BITWISE_AND: return false;
6642 case EXPR_BINARY_BITWISE_OR: return false;
6643 case EXPR_BINARY_BITWISE_XOR: return false;
6644 case EXPR_BINARY_SHIFTLEFT: return false;
6645 case EXPR_BINARY_SHIFTRIGHT: return false;
6646 case EXPR_BINARY_ASSIGN: return true;
6647 case EXPR_BINARY_MUL_ASSIGN: return true;
6648 case EXPR_BINARY_DIV_ASSIGN: return true;
6649 case EXPR_BINARY_MOD_ASSIGN: return true;
6650 case EXPR_BINARY_ADD_ASSIGN: return true;
6651 case EXPR_BINARY_SUB_ASSIGN: return true;
6652 case EXPR_BINARY_SHIFTLEFT_ASSIGN: return true;
6653 case EXPR_BINARY_SHIFTRIGHT_ASSIGN: return true;
6654 case EXPR_BINARY_BITWISE_AND_ASSIGN: return true;
6655 case EXPR_BINARY_BITWISE_XOR_ASSIGN: return true;
6656 case EXPR_BINARY_BITWISE_OR_ASSIGN: return true;
6658 /* Only examine the right hand side of && and ||, because the left hand
6659 * side already has the effect of controlling the execution of the right
6661 case EXPR_BINARY_LOGICAL_AND:
6662 case EXPR_BINARY_LOGICAL_OR:
6663 /* Only examine the right hand side of a comma expression, because the left
6664 * hand side has a separate warning */
6665 case EXPR_BINARY_COMMA:
6666 return expression_has_effect(expr->binary.right);
6668 case EXPR_BINARY_BUILTIN_EXPECT: return true;
6669 case EXPR_BINARY_ISGREATER: return false;
6670 case EXPR_BINARY_ISGREATEREQUAL: return false;
6671 case EXPR_BINARY_ISLESS: return false;
6672 case EXPR_BINARY_ISLESSEQUAL: return false;
6673 case EXPR_BINARY_ISLESSGREATER: return false;
6674 case EXPR_BINARY_ISUNORDERED: return false;
6677 internal_errorf(HERE, "unexpected expression");
6680 static void semantic_comma(binary_expression_t *expression)
6682 if (warning.unused_value) {
6683 const expression_t *const left = expression->left;
6684 if (!expression_has_effect(left)) {
6685 warningf(&left->base.source_position,
6686 "left-hand operand of comma expression has no effect");
6689 expression->base.type = expression->right->base.type;
6692 #define CREATE_BINEXPR_PARSER(token_type, binexpression_type, sfunc, lr) \
6693 static expression_t *parse_##binexpression_type(unsigned precedence, \
6694 expression_t *left) \
6697 source_position_t pos = *HERE; \
6699 expression_t *right = parse_sub_expression(precedence + lr); \
6701 expression_t *binexpr = allocate_expression_zero(binexpression_type); \
6702 binexpr->base.source_position = pos; \
6703 binexpr->binary.left = left; \
6704 binexpr->binary.right = right; \
6705 sfunc(&binexpr->binary); \
6710 CREATE_BINEXPR_PARSER(',', EXPR_BINARY_COMMA, semantic_comma, 1)
6711 CREATE_BINEXPR_PARSER('*', EXPR_BINARY_MUL, semantic_binexpr_arithmetic, 1)
6712 CREATE_BINEXPR_PARSER('/', EXPR_BINARY_DIV, semantic_binexpr_arithmetic, 1)
6713 CREATE_BINEXPR_PARSER('%', EXPR_BINARY_MOD, semantic_binexpr_arithmetic, 1)
6714 CREATE_BINEXPR_PARSER('+', EXPR_BINARY_ADD, semantic_add, 1)
6715 CREATE_BINEXPR_PARSER('-', EXPR_BINARY_SUB, semantic_sub, 1)
6716 CREATE_BINEXPR_PARSER('<', EXPR_BINARY_LESS, semantic_comparison, 1)
6717 CREATE_BINEXPR_PARSER('>', EXPR_BINARY_GREATER, semantic_comparison, 1)
6718 CREATE_BINEXPR_PARSER('=', EXPR_BINARY_ASSIGN, semantic_binexpr_assign, 0)
6720 CREATE_BINEXPR_PARSER(T_EQUALEQUAL, EXPR_BINARY_EQUAL,
6721 semantic_comparison, 1)
6722 CREATE_BINEXPR_PARSER(T_EXCLAMATIONMARKEQUAL, EXPR_BINARY_NOTEQUAL,
6723 semantic_comparison, 1)
6724 CREATE_BINEXPR_PARSER(T_LESSEQUAL, EXPR_BINARY_LESSEQUAL,
6725 semantic_comparison, 1)
6726 CREATE_BINEXPR_PARSER(T_GREATEREQUAL, EXPR_BINARY_GREATEREQUAL,
6727 semantic_comparison, 1)
6729 CREATE_BINEXPR_PARSER('&', EXPR_BINARY_BITWISE_AND,
6730 semantic_binexpr_arithmetic, 1)
6731 CREATE_BINEXPR_PARSER('|', EXPR_BINARY_BITWISE_OR,
6732 semantic_binexpr_arithmetic, 1)
6733 CREATE_BINEXPR_PARSER('^', EXPR_BINARY_BITWISE_XOR,
6734 semantic_binexpr_arithmetic, 1)
6735 CREATE_BINEXPR_PARSER(T_ANDAND, EXPR_BINARY_LOGICAL_AND,
6736 semantic_logical_op, 1)
6737 CREATE_BINEXPR_PARSER(T_PIPEPIPE, EXPR_BINARY_LOGICAL_OR,
6738 semantic_logical_op, 1)
6739 CREATE_BINEXPR_PARSER(T_LESSLESS, EXPR_BINARY_SHIFTLEFT,
6740 semantic_shift_op, 1)
6741 CREATE_BINEXPR_PARSER(T_GREATERGREATER, EXPR_BINARY_SHIFTRIGHT,
6742 semantic_shift_op, 1)
6743 CREATE_BINEXPR_PARSER(T_PLUSEQUAL, EXPR_BINARY_ADD_ASSIGN,
6744 semantic_arithmetic_addsubb_assign, 0)
6745 CREATE_BINEXPR_PARSER(T_MINUSEQUAL, EXPR_BINARY_SUB_ASSIGN,
6746 semantic_arithmetic_addsubb_assign, 0)
6747 CREATE_BINEXPR_PARSER(T_ASTERISKEQUAL, EXPR_BINARY_MUL_ASSIGN,
6748 semantic_arithmetic_assign, 0)
6749 CREATE_BINEXPR_PARSER(T_SLASHEQUAL, EXPR_BINARY_DIV_ASSIGN,
6750 semantic_arithmetic_assign, 0)
6751 CREATE_BINEXPR_PARSER(T_PERCENTEQUAL, EXPR_BINARY_MOD_ASSIGN,
6752 semantic_arithmetic_assign, 0)
6753 CREATE_BINEXPR_PARSER(T_LESSLESSEQUAL, EXPR_BINARY_SHIFTLEFT_ASSIGN,
6754 semantic_arithmetic_assign, 0)
6755 CREATE_BINEXPR_PARSER(T_GREATERGREATEREQUAL, EXPR_BINARY_SHIFTRIGHT_ASSIGN,
6756 semantic_arithmetic_assign, 0)
6757 CREATE_BINEXPR_PARSER(T_ANDEQUAL, EXPR_BINARY_BITWISE_AND_ASSIGN,
6758 semantic_arithmetic_assign, 0)
6759 CREATE_BINEXPR_PARSER(T_PIPEEQUAL, EXPR_BINARY_BITWISE_OR_ASSIGN,
6760 semantic_arithmetic_assign, 0)
6761 CREATE_BINEXPR_PARSER(T_CARETEQUAL, EXPR_BINARY_BITWISE_XOR_ASSIGN,
6762 semantic_arithmetic_assign, 0)
6764 static expression_t *parse_sub_expression(unsigned precedence)
6766 if(token.type < 0) {
6767 return expected_expression_error();
6770 expression_parser_function_t *parser
6771 = &expression_parsers[token.type];
6772 source_position_t source_position = token.source_position;
6775 if(parser->parser != NULL) {
6776 left = parser->parser(parser->precedence);
6778 left = parse_primary_expression();
6780 assert(left != NULL);
6781 left->base.source_position = source_position;
6784 if(token.type < 0) {
6785 return expected_expression_error();
6788 parser = &expression_parsers[token.type];
6789 if(parser->infix_parser == NULL)
6791 if(parser->infix_precedence < precedence)
6794 left = parser->infix_parser(parser->infix_precedence, left);
6796 assert(left != NULL);
6797 assert(left->kind != EXPR_UNKNOWN);
6798 left->base.source_position = source_position;
6805 * Parse an expression.
6807 static expression_t *parse_expression(void)
6809 return parse_sub_expression(1);
6813 * Register a parser for a prefix-like operator with given precedence.
6815 * @param parser the parser function
6816 * @param token_type the token type of the prefix token
6817 * @param precedence the precedence of the operator
6819 static void register_expression_parser(parse_expression_function parser,
6820 int token_type, unsigned precedence)
6822 expression_parser_function_t *entry = &expression_parsers[token_type];
6824 if(entry->parser != NULL) {
6825 diagnosticf("for token '%k'\n", (token_type_t)token_type);
6826 panic("trying to register multiple expression parsers for a token");
6828 entry->parser = parser;
6829 entry->precedence = precedence;
6833 * Register a parser for an infix operator with given precedence.
6835 * @param parser the parser function
6836 * @param token_type the token type of the infix operator
6837 * @param precedence the precedence of the operator
6839 static void register_infix_parser(parse_expression_infix_function parser,
6840 int token_type, unsigned precedence)
6842 expression_parser_function_t *entry = &expression_parsers[token_type];
6844 if(entry->infix_parser != NULL) {
6845 diagnosticf("for token '%k'\n", (token_type_t)token_type);
6846 panic("trying to register multiple infix expression parsers for a "
6849 entry->infix_parser = parser;
6850 entry->infix_precedence = precedence;
6854 * Initialize the expression parsers.
6856 static void init_expression_parsers(void)
6858 memset(&expression_parsers, 0, sizeof(expression_parsers));
6860 register_infix_parser(parse_array_expression, '[', 30);
6861 register_infix_parser(parse_call_expression, '(', 30);
6862 register_infix_parser(parse_select_expression, '.', 30);
6863 register_infix_parser(parse_select_expression, T_MINUSGREATER, 30);
6864 register_infix_parser(parse_EXPR_UNARY_POSTFIX_INCREMENT,
6866 register_infix_parser(parse_EXPR_UNARY_POSTFIX_DECREMENT,
6869 register_infix_parser(parse_EXPR_BINARY_MUL, '*', 16);
6870 register_infix_parser(parse_EXPR_BINARY_DIV, '/', 16);
6871 register_infix_parser(parse_EXPR_BINARY_MOD, '%', 16);
6872 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT, T_LESSLESS, 16);
6873 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT, T_GREATERGREATER, 16);
6874 register_infix_parser(parse_EXPR_BINARY_ADD, '+', 15);
6875 register_infix_parser(parse_EXPR_BINARY_SUB, '-', 15);
6876 register_infix_parser(parse_EXPR_BINARY_LESS, '<', 14);
6877 register_infix_parser(parse_EXPR_BINARY_GREATER, '>', 14);
6878 register_infix_parser(parse_EXPR_BINARY_LESSEQUAL, T_LESSEQUAL, 14);
6879 register_infix_parser(parse_EXPR_BINARY_GREATEREQUAL, T_GREATEREQUAL, 14);
6880 register_infix_parser(parse_EXPR_BINARY_EQUAL, T_EQUALEQUAL, 13);
6881 register_infix_parser(parse_EXPR_BINARY_NOTEQUAL,
6882 T_EXCLAMATIONMARKEQUAL, 13);
6883 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND, '&', 12);
6884 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR, '^', 11);
6885 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR, '|', 10);
6886 register_infix_parser(parse_EXPR_BINARY_LOGICAL_AND, T_ANDAND, 9);
6887 register_infix_parser(parse_EXPR_BINARY_LOGICAL_OR, T_PIPEPIPE, 8);
6888 register_infix_parser(parse_conditional_expression, '?', 7);
6889 register_infix_parser(parse_EXPR_BINARY_ASSIGN, '=', 2);
6890 register_infix_parser(parse_EXPR_BINARY_ADD_ASSIGN, T_PLUSEQUAL, 2);
6891 register_infix_parser(parse_EXPR_BINARY_SUB_ASSIGN, T_MINUSEQUAL, 2);
6892 register_infix_parser(parse_EXPR_BINARY_MUL_ASSIGN, T_ASTERISKEQUAL, 2);
6893 register_infix_parser(parse_EXPR_BINARY_DIV_ASSIGN, T_SLASHEQUAL, 2);
6894 register_infix_parser(parse_EXPR_BINARY_MOD_ASSIGN, T_PERCENTEQUAL, 2);
6895 register_infix_parser(parse_EXPR_BINARY_SHIFTLEFT_ASSIGN,
6896 T_LESSLESSEQUAL, 2);
6897 register_infix_parser(parse_EXPR_BINARY_SHIFTRIGHT_ASSIGN,
6898 T_GREATERGREATEREQUAL, 2);
6899 register_infix_parser(parse_EXPR_BINARY_BITWISE_AND_ASSIGN,
6901 register_infix_parser(parse_EXPR_BINARY_BITWISE_OR_ASSIGN,
6903 register_infix_parser(parse_EXPR_BINARY_BITWISE_XOR_ASSIGN,
6906 register_infix_parser(parse_EXPR_BINARY_COMMA, ',', 1);
6908 register_expression_parser(parse_EXPR_UNARY_NEGATE, '-', 25);
6909 register_expression_parser(parse_EXPR_UNARY_PLUS, '+', 25);
6910 register_expression_parser(parse_EXPR_UNARY_NOT, '!', 25);
6911 register_expression_parser(parse_EXPR_UNARY_BITWISE_NEGATE, '~', 25);
6912 register_expression_parser(parse_EXPR_UNARY_DEREFERENCE, '*', 25);
6913 register_expression_parser(parse_EXPR_UNARY_TAKE_ADDRESS, '&', 25);
6914 register_expression_parser(parse_EXPR_UNARY_PREFIX_INCREMENT,
6916 register_expression_parser(parse_EXPR_UNARY_PREFIX_DECREMENT,
6918 register_expression_parser(parse_sizeof, T_sizeof, 25);
6919 register_expression_parser(parse_alignof, T___alignof__, 25);
6920 register_expression_parser(parse_extension, T___extension__, 25);
6921 register_expression_parser(parse_builtin_classify_type,
6922 T___builtin_classify_type, 25);
6926 * Parse a asm statement constraints specification.
6928 static asm_constraint_t *parse_asm_constraints(void)
6930 asm_constraint_t *result = NULL;
6931 asm_constraint_t *last = NULL;
6933 while(token.type == T_STRING_LITERAL || token.type == '[') {
6934 asm_constraint_t *constraint = allocate_ast_zero(sizeof(constraint[0]));
6935 memset(constraint, 0, sizeof(constraint[0]));
6937 if(token.type == '[') {
6939 if(token.type != T_IDENTIFIER) {
6940 parse_error_expected("while parsing asm constraint",
6941 T_IDENTIFIER, NULL);
6944 constraint->symbol = token.v.symbol;
6949 constraint->constraints = parse_string_literals();
6951 constraint->expression = parse_expression();
6955 last->next = constraint;
6957 result = constraint;
6961 if(token.type != ',')
6972 * Parse a asm statement clobber specification.
6974 static asm_clobber_t *parse_asm_clobbers(void)
6976 asm_clobber_t *result = NULL;
6977 asm_clobber_t *last = NULL;
6979 while(token.type == T_STRING_LITERAL) {
6980 asm_clobber_t *clobber = allocate_ast_zero(sizeof(clobber[0]));
6981 clobber->clobber = parse_string_literals();
6984 last->next = clobber;
6990 if(token.type != ',')
6999 * Parse an asm statement.
7001 static statement_t *parse_asm_statement(void)
7005 statement_t *statement = allocate_statement_zero(STATEMENT_ASM);
7006 statement->base.source_position = token.source_position;
7008 asm_statement_t *asm_statement = &statement->asms;
7010 if(token.type == T_volatile) {
7012 asm_statement->is_volatile = true;
7016 add_anchor_token(')');
7017 add_anchor_token(':');
7018 asm_statement->asm_text = parse_string_literals();
7020 if(token.type != ':') {
7021 rem_anchor_token(':');
7026 asm_statement->inputs = parse_asm_constraints();
7027 if(token.type != ':') {
7028 rem_anchor_token(':');
7033 asm_statement->outputs = parse_asm_constraints();
7034 if(token.type != ':') {
7035 rem_anchor_token(':');
7038 rem_anchor_token(':');
7041 asm_statement->clobbers = parse_asm_clobbers();
7044 rem_anchor_token(')');
7049 return create_invalid_statement();
7053 * Parse a case statement.
7055 static statement_t *parse_case_statement(void)
7059 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
7061 statement->base.source_position = token.source_position;
7062 statement->case_label.expression = parse_expression();
7064 if (c_mode & _GNUC) {
7065 if (token.type == T_DOTDOTDOT) {
7067 statement->case_label.end_range = parse_expression();
7073 if (! is_constant_expression(statement->case_label.expression)) {
7074 errorf(&statement->base.source_position,
7075 "case label does not reduce to an integer constant");
7077 /* TODO: check if the case label is already known */
7078 if (current_switch != NULL) {
7079 /* link all cases into the switch statement */
7080 if (current_switch->last_case == NULL) {
7081 current_switch->first_case =
7082 current_switch->last_case = &statement->case_label;
7084 current_switch->last_case->next = &statement->case_label;
7087 errorf(&statement->base.source_position,
7088 "case label not within a switch statement");
7091 statement->case_label.statement = parse_statement();
7095 return create_invalid_statement();
7099 * Finds an existing default label of a switch statement.
7101 static case_label_statement_t *
7102 find_default_label(const switch_statement_t *statement)
7104 case_label_statement_t *label = statement->first_case;
7105 for ( ; label != NULL; label = label->next) {
7106 if (label->expression == NULL)
7113 * Parse a default statement.
7115 static statement_t *parse_default_statement(void)
7119 statement_t *statement = allocate_statement_zero(STATEMENT_CASE_LABEL);
7121 statement->base.source_position = token.source_position;
7124 if (current_switch != NULL) {
7125 const case_label_statement_t *def_label = find_default_label(current_switch);
7126 if (def_label != NULL) {
7127 errorf(HERE, "multiple default labels in one switch (previous declared %P)",
7128 &def_label->base.source_position);
7130 /* link all cases into the switch statement */
7131 if (current_switch->last_case == NULL) {
7132 current_switch->first_case =
7133 current_switch->last_case = &statement->case_label;
7135 current_switch->last_case->next = &statement->case_label;
7139 errorf(&statement->base.source_position,
7140 "'default' label not within a switch statement");
7142 statement->case_label.statement = parse_statement();
7146 return create_invalid_statement();
7150 * Return the declaration for a given label symbol or create a new one.
7152 static declaration_t *get_label(symbol_t *symbol)
7154 declaration_t *candidate = get_declaration(symbol, NAMESPACE_LABEL);
7155 assert(current_function != NULL);
7156 /* if we found a label in the same function, then we already created the
7158 if(candidate != NULL
7159 && candidate->parent_scope == ¤t_function->scope) {
7163 /* otherwise we need to create a new one */
7164 declaration_t *const declaration = allocate_declaration_zero();
7165 declaration->namespc = NAMESPACE_LABEL;
7166 declaration->symbol = symbol;
7168 label_push(declaration);
7174 * Parse a label statement.
7176 static statement_t *parse_label_statement(void)
7178 assert(token.type == T_IDENTIFIER);
7179 symbol_t *symbol = token.v.symbol;
7182 declaration_t *label = get_label(symbol);
7184 /* if source position is already set then the label is defined twice,
7185 * otherwise it was just mentioned in a goto so far */
7186 if(label->source_position.input_name != NULL) {
7187 errorf(HERE, "duplicate label '%Y' (declared %P)",
7188 symbol, &label->source_position);
7190 label->source_position = token.source_position;
7193 statement_t *statement = allocate_statement_zero(STATEMENT_LABEL);
7195 statement->base.source_position = token.source_position;
7196 statement->label.label = label;
7200 if(token.type == '}') {
7201 /* TODO only warn? */
7203 warningf(HERE, "label at end of compound statement");
7204 statement->label.statement = create_empty_statement();
7206 errorf(HERE, "label at end of compound statement");
7207 statement->label.statement = create_invalid_statement();
7211 if (token.type == ';') {
7212 /* eat an empty statement here, to avoid the warning about an empty
7213 * after a label. label:; is commonly used to have a label before
7215 statement->label.statement = create_empty_statement();
7218 statement->label.statement = parse_statement();
7222 /* remember the labels's in a list for later checking */
7223 if (label_last == NULL) {
7224 label_first = &statement->label;
7226 label_last->next = &statement->label;
7228 label_last = &statement->label;
7234 * Parse an if statement.
7236 static statement_t *parse_if(void)
7240 statement_t *statement = allocate_statement_zero(STATEMENT_IF);
7241 statement->base.source_position = token.source_position;
7244 add_anchor_token(')');
7245 statement->ifs.condition = parse_expression();
7246 rem_anchor_token(')');
7249 add_anchor_token(T_else);
7250 statement->ifs.true_statement = parse_statement();
7251 rem_anchor_token(T_else);
7253 if(token.type == T_else) {
7255 statement->ifs.false_statement = parse_statement();
7260 return create_invalid_statement();
7264 * Parse a switch statement.
7266 static statement_t *parse_switch(void)
7270 statement_t *statement = allocate_statement_zero(STATEMENT_SWITCH);
7271 statement->base.source_position = token.source_position;
7274 expression_t *const expr = parse_expression();
7275 type_t * type = skip_typeref(expr->base.type);
7276 if (is_type_integer(type)) {
7277 type = promote_integer(type);
7278 } else if (is_type_valid(type)) {
7279 errorf(&expr->base.source_position,
7280 "switch quantity is not an integer, but '%T'", type);
7281 type = type_error_type;
7283 statement->switchs.expression = create_implicit_cast(expr, type);
7286 switch_statement_t *rem = current_switch;
7287 current_switch = &statement->switchs;
7288 statement->switchs.body = parse_statement();
7289 current_switch = rem;
7291 if(warning.switch_default &&
7292 find_default_label(&statement->switchs) == NULL) {
7293 warningf(&statement->base.source_position, "switch has no default case");
7298 return create_invalid_statement();
7301 static statement_t *parse_loop_body(statement_t *const loop)
7303 statement_t *const rem = current_loop;
7304 current_loop = loop;
7306 statement_t *const body = parse_statement();
7313 * Parse a while statement.
7315 static statement_t *parse_while(void)
7319 statement_t *statement = allocate_statement_zero(STATEMENT_WHILE);
7320 statement->base.source_position = token.source_position;
7323 add_anchor_token(')');
7324 statement->whiles.condition = parse_expression();
7325 rem_anchor_token(')');
7328 statement->whiles.body = parse_loop_body(statement);
7332 return create_invalid_statement();
7336 * Parse a do statement.
7338 static statement_t *parse_do(void)
7342 statement_t *statement = allocate_statement_zero(STATEMENT_DO_WHILE);
7344 statement->base.source_position = token.source_position;
7346 add_anchor_token(T_while);
7347 statement->do_while.body = parse_loop_body(statement);
7348 rem_anchor_token(T_while);
7352 add_anchor_token(')');
7353 statement->do_while.condition = parse_expression();
7354 rem_anchor_token(')');
7360 return create_invalid_statement();
7364 * Parse a for statement.
7366 static statement_t *parse_for(void)
7370 statement_t *statement = allocate_statement_zero(STATEMENT_FOR);
7371 statement->base.source_position = token.source_position;
7373 int top = environment_top();
7374 scope_t *last_scope = scope;
7375 set_scope(&statement->fors.scope);
7378 add_anchor_token(')');
7380 if(token.type != ';') {
7381 if(is_declaration_specifier(&token, false)) {
7382 parse_declaration(record_declaration);
7384 add_anchor_token(';');
7385 expression_t *const init = parse_expression();
7386 statement->fors.initialisation = init;
7387 if (warning.unused_value && !expression_has_effect(init)) {
7388 warningf(&init->base.source_position,
7389 "initialisation of 'for'-statement has no effect");
7391 rem_anchor_token(';');
7398 if(token.type != ';') {
7399 add_anchor_token(';');
7400 statement->fors.condition = parse_expression();
7401 rem_anchor_token(';');
7404 if(token.type != ')') {
7405 expression_t *const step = parse_expression();
7406 statement->fors.step = step;
7407 if (warning.unused_value && !expression_has_effect(step)) {
7408 warningf(&step->base.source_position,
7409 "step of 'for'-statement has no effect");
7412 rem_anchor_token(')');
7414 statement->fors.body = parse_loop_body(statement);
7416 assert(scope == &statement->fors.scope);
7417 set_scope(last_scope);
7418 environment_pop_to(top);
7423 rem_anchor_token(')');
7424 assert(scope == &statement->fors.scope);
7425 set_scope(last_scope);
7426 environment_pop_to(top);
7428 return create_invalid_statement();
7432 * Parse a goto statement.
7434 static statement_t *parse_goto(void)
7438 if(token.type != T_IDENTIFIER) {
7439 parse_error_expected("while parsing goto", T_IDENTIFIER, NULL);
7443 symbol_t *symbol = token.v.symbol;
7446 declaration_t *label = get_label(symbol);
7448 statement_t *statement = allocate_statement_zero(STATEMENT_GOTO);
7449 statement->base.source_position = token.source_position;
7451 statement->gotos.label = label;
7453 /* remember the goto's in a list for later checking */
7454 if (goto_last == NULL) {
7455 goto_first = &statement->gotos;
7457 goto_last->next = &statement->gotos;
7459 goto_last = &statement->gotos;
7465 return create_invalid_statement();
7469 * Parse a continue statement.
7471 static statement_t *parse_continue(void)
7473 statement_t *statement;
7474 if (current_loop == NULL) {
7475 errorf(HERE, "continue statement not within loop");
7476 statement = create_invalid_statement();
7478 statement = allocate_statement_zero(STATEMENT_CONTINUE);
7480 statement->base.source_position = token.source_position;
7488 return create_invalid_statement();
7492 * Parse a break statement.
7494 static statement_t *parse_break(void)
7496 statement_t *statement;
7497 if (current_switch == NULL && current_loop == NULL) {
7498 errorf(HERE, "break statement not within loop or switch");
7499 statement = create_invalid_statement();
7501 statement = allocate_statement_zero(STATEMENT_BREAK);
7503 statement->base.source_position = token.source_position;
7511 return create_invalid_statement();
7515 * Parse a __leave statement.
7517 static statement_t *parse_leave(void)
7519 statement_t *statement;
7520 if (current_try == NULL) {
7521 errorf(HERE, "__leave statement not within __try");
7522 statement = create_invalid_statement();
7524 statement = allocate_statement_zero(STATEMENT_LEAVE);
7526 statement->base.source_position = token.source_position;
7534 return create_invalid_statement();
7538 * Check if a given declaration represents a local variable.
7540 static bool is_local_var_declaration(const declaration_t *declaration) {
7541 switch ((storage_class_tag_t) declaration->storage_class) {
7542 case STORAGE_CLASS_AUTO:
7543 case STORAGE_CLASS_REGISTER: {
7544 const type_t *type = skip_typeref(declaration->type);
7545 if(is_type_function(type)) {
7557 * Check if a given declaration represents a variable.
7559 static bool is_var_declaration(const declaration_t *declaration) {
7560 if(declaration->storage_class == STORAGE_CLASS_TYPEDEF)
7563 const type_t *type = skip_typeref(declaration->type);
7564 return !is_type_function(type);
7568 * Check if a given expression represents a local variable.
7570 static bool is_local_variable(const expression_t *expression)
7572 if (expression->base.kind != EXPR_REFERENCE) {
7575 const declaration_t *declaration = expression->reference.declaration;
7576 return is_local_var_declaration(declaration);
7580 * Check if a given expression represents a local variable and
7581 * return its declaration then, else return NULL.
7583 declaration_t *expr_is_variable(const expression_t *expression)
7585 if (expression->base.kind != EXPR_REFERENCE) {
7588 declaration_t *declaration = expression->reference.declaration;
7589 if (is_var_declaration(declaration))
7595 * Parse a return statement.
7597 static statement_t *parse_return(void)
7599 statement_t *statement = allocate_statement_zero(STATEMENT_RETURN);
7600 statement->base.source_position = token.source_position;
7604 expression_t *return_value = NULL;
7605 if(token.type != ';') {
7606 return_value = parse_expression();
7610 const type_t *const func_type = current_function->type;
7611 assert(is_type_function(func_type));
7612 type_t *const return_type = skip_typeref(func_type->function.return_type);
7614 if(return_value != NULL) {
7615 type_t *return_value_type = skip_typeref(return_value->base.type);
7617 if(is_type_atomic(return_type, ATOMIC_TYPE_VOID)
7618 && !is_type_atomic(return_value_type, ATOMIC_TYPE_VOID)) {
7619 warningf(&statement->base.source_position,
7620 "'return' with a value, in function returning void");
7621 return_value = NULL;
7623 type_t *const res_type = semantic_assign(return_type,
7624 return_value, "'return'", &statement->base.source_position);
7625 if (res_type == NULL) {
7626 errorf(&statement->base.source_position,
7627 "cannot return something of type '%T' in function returning '%T'",
7628 return_value->base.type, return_type);
7630 return_value = create_implicit_cast(return_value, res_type);
7633 /* check for returning address of a local var */
7634 if (return_value->base.kind == EXPR_UNARY_TAKE_ADDRESS) {
7635 const expression_t *expression = return_value->unary.value;
7636 if (is_local_variable(expression)) {
7637 warningf(&statement->base.source_position,
7638 "function returns address of local variable");
7642 if(!is_type_atomic(return_type, ATOMIC_TYPE_VOID)) {
7643 warningf(&statement->base.source_position,
7644 "'return' without value, in function returning non-void");
7647 statement->returns.value = return_value;
7651 return create_invalid_statement();
7655 * Parse a declaration statement.
7657 static statement_t *parse_declaration_statement(void)
7659 statement_t *statement = allocate_statement_zero(STATEMENT_DECLARATION);
7661 statement->base.source_position = token.source_position;
7663 declaration_t *before = last_declaration;
7664 parse_declaration(record_declaration);
7666 if(before == NULL) {
7667 statement->declaration.declarations_begin = scope->declarations;
7669 statement->declaration.declarations_begin = before->next;
7671 statement->declaration.declarations_end = last_declaration;
7677 * Parse an expression statement, ie. expr ';'.
7679 static statement_t *parse_expression_statement(void)
7681 statement_t *statement = allocate_statement_zero(STATEMENT_EXPRESSION);
7683 statement->base.source_position = token.source_position;
7684 expression_t *const expr = parse_expression();
7685 statement->expression.expression = expr;
7691 return create_invalid_statement();
7695 * Parse a microsoft __try { } __finally { } or
7696 * __try{ } __except() { }
7698 static statement_t *parse_ms_try_statment(void) {
7699 statement_t *statement = allocate_statement_zero(STATEMENT_MS_TRY);
7701 statement->base.source_position = token.source_position;
7704 ms_try_statement_t *rem = current_try;
7705 current_try = &statement->ms_try;
7706 statement->ms_try.try_statement = parse_compound_statement(false);
7709 if(token.type == T___except) {
7712 add_anchor_token(')');
7713 expression_t *const expr = parse_expression();
7714 type_t * type = skip_typeref(expr->base.type);
7715 if (is_type_integer(type)) {
7716 type = promote_integer(type);
7717 } else if (is_type_valid(type)) {
7718 errorf(&expr->base.source_position,
7719 "__expect expression is not an integer, but '%T'", type);
7720 type = type_error_type;
7722 statement->ms_try.except_expression = create_implicit_cast(expr, type);
7723 rem_anchor_token(')');
7725 statement->ms_try.final_statement = parse_compound_statement(false);
7726 } else if(token.type == T__finally) {
7728 statement->ms_try.final_statement = parse_compound_statement(false);
7730 parse_error_expected("while parsing __try statement", T___except, T___finally, NULL);
7731 return create_invalid_statement();
7735 return create_invalid_statement();
7739 * Parse a statement.
7740 * There's also parse_statement() which additionally checks for
7741 * "statement has no effect" warnings
7743 static statement_t *intern_parse_statement(void)
7745 statement_t *statement = NULL;
7747 /* declaration or statement */
7748 add_anchor_token(';');
7749 switch(token.type) {
7751 statement = parse_asm_statement();
7755 statement = parse_case_statement();
7759 statement = parse_default_statement();
7763 statement = parse_compound_statement(false);
7767 statement = parse_if();
7771 statement = parse_switch();
7775 statement = parse_while();
7779 statement = parse_do();
7783 statement = parse_for();
7787 statement = parse_goto();
7791 statement = parse_continue();
7795 statement = parse_break();
7799 statement = parse_leave();
7803 statement = parse_return();
7807 if(warning.empty_statement) {
7808 warningf(HERE, "statement is empty");
7810 statement = create_empty_statement();
7815 if(look_ahead(1)->type == ':') {
7816 statement = parse_label_statement();
7820 if(is_typedef_symbol(token.v.symbol)) {
7821 statement = parse_declaration_statement();
7825 statement = parse_expression_statement();
7828 case T___extension__:
7829 /* this can be a prefix to a declaration or an expression statement */
7830 /* we simply eat it now and parse the rest with tail recursion */
7833 } while(token.type == T___extension__);
7834 statement = parse_statement();
7838 statement = parse_declaration_statement();
7842 statement = parse_ms_try_statment();
7846 statement = parse_expression_statement();
7849 rem_anchor_token(';');
7851 assert(statement != NULL
7852 && statement->base.source_position.input_name != NULL);
7858 * parse a statement and emits "statement has no effect" warning if needed
7859 * (This is really a wrapper around intern_parse_statement with check for 1
7860 * single warning. It is needed, because for statement expressions we have
7861 * to avoid the warning on the last statement)
7863 static statement_t *parse_statement(void)
7865 statement_t *statement = intern_parse_statement();
7867 if(statement->kind == STATEMENT_EXPRESSION && warning.unused_value) {
7868 expression_t *expression = statement->expression.expression;
7869 if(!expression_has_effect(expression)) {
7870 warningf(&expression->base.source_position,
7871 "statement has no effect");
7879 * Parse a compound statement.
7881 static statement_t *parse_compound_statement(bool inside_expression_statement)
7883 statement_t *statement = allocate_statement_zero(STATEMENT_COMPOUND);
7885 statement->base.source_position = token.source_position;
7888 add_anchor_token('}');
7890 int top = environment_top();
7891 scope_t *last_scope = scope;
7892 set_scope(&statement->compound.scope);
7894 statement_t *last_statement = NULL;
7896 while(token.type != '}' && token.type != T_EOF) {
7897 statement_t *sub_statement = intern_parse_statement();
7898 if(is_invalid_statement(sub_statement)) {
7899 /* an error occurred. if we are at an anchor, return */
7905 if(last_statement != NULL) {
7906 last_statement->base.next = sub_statement;
7908 statement->compound.statements = sub_statement;
7911 while(sub_statement->base.next != NULL)
7912 sub_statement = sub_statement->base.next;
7914 last_statement = sub_statement;
7917 if(token.type == '}') {
7920 errorf(&statement->base.source_position,
7921 "end of file while looking for closing '}'");
7924 /* look over all statements again to produce no effect warnings */
7925 if(warning.unused_value) {
7926 statement_t *sub_statement = statement->compound.statements;
7927 for( ; sub_statement != NULL; sub_statement = sub_statement->base.next) {
7928 if(sub_statement->kind != STATEMENT_EXPRESSION)
7930 /* don't emit a warning for the last expression in an expression
7931 * statement as it has always an effect */
7932 if(inside_expression_statement && sub_statement->base.next == NULL)
7935 expression_t *expression = sub_statement->expression.expression;
7936 if(!expression_has_effect(expression)) {
7937 warningf(&expression->base.source_position,
7938 "statement has no effect");
7944 rem_anchor_token('}');
7945 assert(scope == &statement->compound.scope);
7946 set_scope(last_scope);
7947 environment_pop_to(top);
7953 * Initialize builtin types.
7955 static void initialize_builtin_types(void)
7957 type_intmax_t = make_global_typedef("__intmax_t__", type_long_long);
7958 type_size_t = make_global_typedef("__SIZE_TYPE__", type_unsigned_long);
7959 type_ssize_t = make_global_typedef("__SSIZE_TYPE__", type_long);
7960 type_ptrdiff_t = make_global_typedef("__PTRDIFF_TYPE__", type_long);
7961 type_uintmax_t = make_global_typedef("__uintmax_t__", type_unsigned_long_long);
7962 type_uptrdiff_t = make_global_typedef("__UPTRDIFF_TYPE__", type_unsigned_long);
7963 type_wchar_t = make_global_typedef("__WCHAR_TYPE__", type_int);
7964 type_wint_t = make_global_typedef("__WINT_TYPE__", type_int);
7966 type_intmax_t_ptr = make_pointer_type(type_intmax_t, TYPE_QUALIFIER_NONE);
7967 type_ptrdiff_t_ptr = make_pointer_type(type_ptrdiff_t, TYPE_QUALIFIER_NONE);
7968 type_ssize_t_ptr = make_pointer_type(type_ssize_t, TYPE_QUALIFIER_NONE);
7969 type_wchar_t_ptr = make_pointer_type(type_wchar_t, TYPE_QUALIFIER_NONE);
7973 * Check for unused global static functions and variables
7975 static void check_unused_globals(void)
7977 if (!warning.unused_function && !warning.unused_variable)
7980 for (const declaration_t *decl = global_scope->declarations; decl != NULL; decl = decl->next) {
7981 if (decl->used || decl->storage_class != STORAGE_CLASS_STATIC)
7984 type_t *const type = decl->type;
7986 if (is_type_function(skip_typeref(type))) {
7987 if (!warning.unused_function || decl->is_inline)
7990 s = (decl->init.statement != NULL ? "defined" : "declared");
7992 if (!warning.unused_variable)
7998 warningf(&decl->source_position, "'%#T' %s but not used",
7999 type, decl->symbol, s);
8004 * Parse a translation unit.
8006 static translation_unit_t *parse_translation_unit(void)
8008 translation_unit_t *unit = allocate_ast_zero(sizeof(unit[0]));
8010 assert(global_scope == NULL);
8011 global_scope = &unit->scope;
8013 assert(scope == NULL);
8014 set_scope(&unit->scope);
8016 initialize_builtin_types();
8018 while(token.type != T_EOF) {
8019 if (token.type == ';') {
8020 /* TODO error in strict mode */
8021 warningf(HERE, "stray ';' outside of function");
8024 parse_external_declaration();
8028 assert(scope == &unit->scope);
8030 last_declaration = NULL;
8032 assert(global_scope == &unit->scope);
8033 check_unused_globals();
8034 global_scope = NULL;
8042 * @return the translation unit or NULL if errors occurred.
8044 translation_unit_t *parse(void)
8046 environment_stack = NEW_ARR_F(stack_entry_t, 0);
8047 label_stack = NEW_ARR_F(stack_entry_t, 0);
8048 diagnostic_count = 0;
8052 type_set_output(stderr);
8053 ast_set_output(stderr);
8055 lookahead_bufpos = 0;
8056 for(int i = 0; i < MAX_LOOKAHEAD + 2; ++i) {
8059 translation_unit_t *unit = parse_translation_unit();
8061 DEL_ARR_F(environment_stack);
8062 DEL_ARR_F(label_stack);
8068 * Initialize the parser.
8070 void init_parser(void)
8073 /* add predefined symbols for extended-decl-modifier */
8074 sym_align = symbol_table_insert("align");
8075 sym_allocate = symbol_table_insert("allocate");
8076 sym_dllimport = symbol_table_insert("dllimport");
8077 sym_dllexport = symbol_table_insert("dllexport");
8078 sym_naked = symbol_table_insert("naked");
8079 sym_noinline = symbol_table_insert("noinline");
8080 sym_noreturn = symbol_table_insert("noreturn");
8081 sym_nothrow = symbol_table_insert("nothrow");
8082 sym_novtable = symbol_table_insert("novtable");
8083 sym_property = symbol_table_insert("property");
8084 sym_get = symbol_table_insert("get");
8085 sym_put = symbol_table_insert("put");
8086 sym_selectany = symbol_table_insert("selectany");
8087 sym_thread = symbol_table_insert("thread");
8088 sym_uuid = symbol_table_insert("uuid");
8089 sym_deprecated = symbol_table_insert("deprecated");
8090 sym_restrict = symbol_table_insert("restrict");
8091 sym_noalias = symbol_table_insert("noalias");
8093 memset(token_anchor_set, 0, sizeof(token_anchor_set));
8095 init_expression_parsers();
8096 obstack_init(&temp_obst);
8098 symbol_t *const va_list_sym = symbol_table_insert("__builtin_va_list");
8099 type_valist = create_builtin_type(va_list_sym, type_void_ptr);
8103 * Terminate the parser.
8105 void exit_parser(void)
8107 obstack_free(&temp_obst, NULL);